Rework links to Spring Boot in reference docs

Closes gh-33776

Author: bclozel

Diff for: framework-docs/antora.yml

@@ -42,7 +42,8 @@ asciidoc:
     spring-framework-reference: '{spring-framework-docs-root}/{spring-version}/reference'
     #
     # Other Spring portfolio projects
-    spring-boot-docs: '{docs-site}/spring-boot/docs/current/reference/html'
+    spring-boot-docs: '{docs-site}/spring-boot'
+    spring-boot-docs-ref: '{spring-boot-docs}/reference'
     spring-boot-issues: '{spring-github-org}/spring-boot/issues'
     # TODO add more projects / links or just build up on {docs-site}?
     # TODO rename the below using new conventions

Diff for: framework-docs/modules/ROOT/pages/core/spring-jcl.adoc

@@ -9,7 +9,7 @@ known as _JUL_ or `java.util.logging`) if neither Log4j 2.x nor SLF4J is availab
 
 Put Log4j 2.x or Logback (or another SLF4J provider) in your classpath, without any extra
 bridges, and let the framework auto-adapt to your choice. For further information see the
-{spring-boot-docs}/features.html#features.logging[Spring
+{spring-boot-docs-ref}/features/logging.html[Spring
 Boot Logging Reference Documentation].
 
 [NOTE]

Diff for: framework-docs/modules/ROOT/pages/integration/observability.adoc

@@ -7,7 +7,7 @@ Metrics can help you to track error rates, usage patterns, performance, and more
 Traces provide a holistic view of an entire system, crossing application boundaries; you can zoom in on particular user requests and follow their entire completion across applications.
 
 Spring Framework instruments various parts of its own codebase to publish observations if an `ObservationRegistry` is configured.
-You can learn more about {spring-boot-docs}/actuator.html#actuator.metrics[configuring the observability infrastructure in Spring Boot].
+You can learn more about {spring-boot-docs-ref}/actuator/observability.html[configuring the observability infrastructure in Spring Boot].
 
 
 [[observability.list]]

Diff for: framework-docs/modules/ROOT/pages/languages/kotlin.adoc

@@ -13,7 +13,7 @@ Most of the code samples of the reference documentation are
 provided in Kotlin in addition to Java.
 
 The easiest way to build a Spring application with Kotlin is to leverage Spring Boot and
-its {spring-boot-docs}/boot-features-kotlin.html[dedicated Kotlin support].
+its {spring-boot-docs-ref}/features/kotlin.html[dedicated Kotlin support].
 {spring-site-guides}/tutorials/spring-boot-kotlin/[This comprehensive tutorial]
 will teach you how to build Spring Boot applications with Kotlin using https://start.spring.io/#!language=kotlin&type=gradle-project[start.spring.io].
 

Diff for: framework-docs/modules/ROOT/pages/languages/kotlin/spring-projects-in.adoc

@@ -186,7 +186,7 @@ Therefore, if you wish to use the `@Value` annotation in Kotlin, you need to esc
 character by writing pass:q[`@Value("\${property}")`].
 
 NOTE: If you use Spring Boot, you should probably use
-{spring-boot-docs}/boot-features-external-config.html#boot-features-external-config-typesafe-configuration-properties[`@ConfigurationProperties`]
+{spring-boot-docs-ref}/features/external-config.html#features.external-config.typesafe-configuration-properties[`@ConfigurationProperties`]
 instead of `@Value` annotations.
 
 As an alternative, you can customize the property placeholder prefix by declaring the
@@ -323,7 +323,7 @@ The recommended testing framework is https://junit.org/junit5/[JUnit 5] along wi
 https://mockk.io/[Mockk] for mocking.
 
 NOTE: If you are using Spring Boot, see
-{spring-boot-docs}/features.html#features.kotlin.testing[this related documentation].
+{spring-boot-docs-ref}/features/kotlin.html#features.kotlin.testing[this related documentation].
 
 
 [[constructor-injection]]

Diff for: framework-docs/modules/ROOT/pages/testing/mockmvc/hamcrest/vs-streaming-response.adoc

@@ -7,7 +7,7 @@ streams because there is no way to cancel the server stream from the client side
 To test infinite streams, you'll need to
 xref:testing/webtestclient.adoc#webtestclient-server-config[bind to] a running server,
 or when using Spring Boot,
-{spring-boot-docs}/spring-boot-features.html#boot-features-testing-spring-boot-applications-testing-with-running-server[test with a running server].
+{spring-boot-docs-ref}/testing/spring-boot-applications.html#testing.spring-boot-applications.with-running-server[test with a running server].
 
 `MockMvcWebTestClient` does support asynchronous responses, and even streaming responses.
 The limitation is that it can't influence the server to stop, and therefore the server

Diff for: framework-docs/modules/ROOT/pages/testing/mockmvc/vs-end-to-end-integration-tests.adoc

@@ -21,7 +21,7 @@ for rendering JSON, XML, and other formats through `@ResponseBody` methods.
 
 Alternatively, you may consider the full end-to-end integration testing support from
 Spring Boot with `@SpringBootTest`. See the
-{spring-boot-docs}/spring-boot-features.html#boot-features-testing[Spring Boot Reference Guide].
+{spring-boot-docs-ref}/testing/spring-boot-applications.html[Spring Boot Reference Guide].
 
 There are pros and cons for each approach. The options provided in Spring MVC Test are
 different stops on the scale from classic unit testing to full integration testing. To be

Diff for: framework-docs/modules/ROOT/pages/web/webflux/config.adoc

@@ -47,7 +47,7 @@ Kotlin::
 NOTE: When using Spring Boot, you may want to use `@Configuration` classes of type `WebFluxConfigurer` but without
 `@EnableWebFlux` to keep Spring Boot WebFlux customizations. See more details in
 xref:#webflux-config-customize[the WebFlux config API section] and in
-{spring-boot-docs}/web.html#web.reactive.webflux.auto-configuration[the dedicated Spring Boot documentation].
+{spring-boot-docs-ref}/web/reactive.html#web.reactive.webflux.auto-configuration[the dedicated Spring Boot documentation].
 
 The preceding example registers a number of Spring WebFlux
 xref:web/webflux/dispatcher-handler.adoc#webflux-special-bean-types[infrastructure beans] and adapts to dependencies

Diff for: framework-docs/modules/ROOT/pages/web/webmvc/mvc-config/enable.adoc

@@ -7,7 +7,7 @@ You can use the `@EnableWebMvc` annotation to enable MVC configuration with prog
 
 include-code::./WebConfiguration[tag=snippet,indent=0]
 
-NOTE: When using Spring Boot, you may want to use `@Configuration` classes of type `WebMvcConfigurer` but without `@EnableWebMvc` to keep Spring Boot MVC customizations. See more details in xref:web/webmvc/mvc-config/customize.adoc[the MVC Config API section] and in {spring-boot-docs}/web.html#web.servlet.spring-mvc.auto-configuration[the dedicated Spring Boot documentation].
+NOTE: When using Spring Boot, you may want to use `@Configuration` classes of type `WebMvcConfigurer` but without `@EnableWebMvc` to keep Spring Boot MVC customizations. See more details in xref:web/webmvc/mvc-config/customize.adoc[the MVC Config API section] and in {spring-boot-docs-ref}/web/servlet.html#web.servlet.spring-mvc.auto-configuration[the dedicated Spring Boot documentation].
 
 The preceding example registers a number of Spring MVC
 xref:web/webmvc/mvc-servlet/special-bean-types.adoc[infrastructure beans] and adapts to dependencies

Diff for: framework-docs/modules/ROOT/pages/web/webmvc/mvc-config/message-converters.adoc

@@ -11,7 +11,7 @@ You can also customize the list of configured message converters at the end by o
 
 TIP: In a Spring Boot application, the `WebMvcAutoConfiguration` adds any
 `HttpMessageConverter` beans it detects, in addition to default converters. Hence, in a
-Boot application, prefer to use the {spring-boot-docs}/web.html#web.servlet.spring-mvc.message-converters[HttpMessageConverters]
+Boot application, prefer to use the {spring-boot-docs-ref}/web/servlet.html#web.servlet.spring-mvc.message-converters[HttpMessageConverters]
 mechanism. Or alternatively, use `extendMessageConverters` to modify message converters
 at the end.
 

Diff for: framework-docs/modules/ROOT/pages/web/webmvc/mvc-servlet.adoc

@@ -111,7 +111,7 @@ the lifecycle of the Servlet container, Spring Boot uses Spring configuration to
 bootstrap itself and the embedded Servlet container. `Filter` and `Servlet` declarations
 are detected in Spring configuration and registered with the Servlet container.
 For more details, see the
-{spring-boot-docs}/web.html#web.servlet.embedded-container[Spring Boot documentation].
+{spring-boot-docs-ref}/web/servlet.html#web.servlet.embedded-container[Spring Boot documentation].