Merge source and substitution configuration in reference docs

Closes gh-25545

Author: diguage

src/docs/asciidoc/core/core-appendix.adoc

@@ -682,8 +682,7 @@ XML extension (a custom XML element) that lets us configure objects of the type
 `SimpleDateFormat` (from the `java.text` package). When we are done,
 we will be able to define bean definitions of type `SimpleDateFormat` as follows:
 
-[source,xml,indent=0]
-[subs="verbatim,quotes"]
+[source,xml,indent=0,subs="verbatim,quotes"]
 ----
 	<myns:dateformat id="dateFormat"
 		pattern="yyyy-MM-dd HH:mm"

src/docs/asciidoc/core/core-beans.adoc

@@ -135,8 +135,7 @@ dependency-inject domain objects with Spring>>.
 
 The following example shows the basic structure of XML-based configuration metadata:
 
-[source,xml,indent=0]
-[subs="verbatim,quotes"]
+[source,xml,indent=0,subs="verbatim,quotes"]
 ----
 	<?xml version="1.0" encoding="UTF-8"?>
 	<beans xmlns="http://www.springframework.org/schema/beans"
@@ -1980,8 +1979,7 @@ then nested `constructor-arg` elements.
 The following example uses the `c:` namespace to do the same thing as the from
 <<beans-constructor-injection>>:
 
-[source,xml,indent=0]
-[subs="verbatim,quotes"]
+[source,xml,indent=0,subs="verbatim,quotes"]
 ----
 	<beans xmlns="http://www.springframework.org/schema/beans"
 		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
@@ -3428,8 +3426,7 @@ you can use the `init-method` attribute to specify the name of the method that h
 no-argument signature. With Java configuration, you can use the `initMethod` attribute of
 `@Bean`. See <<beans-java-lifecycle-callbacks>>. Consider the following example:
 
-[source,xml,indent=0]
-[subs="verbatim,quotes"]
+[source,xml,indent=0,subs="verbatim,quotes"]
 ----
 	<bean id="exampleInitBean" class="examples.ExampleBean" init-method="init"/>
 ----
@@ -7852,8 +7849,7 @@ To enable component scanning, you can annotate your `@Configuration` class as fo
 Experienced Spring users may be familiar with the XML declaration equivalent from
 Spring's `context:` namespace, shown in the following example:
 
-[source,xml,indent=0]
-[subs="verbatim,quotes"]
+[source,xml,indent=0,subs="verbatim,quotes"]
 ----
 	<beans>
 		<context:component-scan base-package="com.acme"/>

src/docs/asciidoc/data-access.adoc

@@ -8844,8 +8844,7 @@ You can configure marshallers more concisely by using tags from the OXM namespac
 To make these tags available, you must first reference the appropriate schema in the
 preamble of the XML configuration file. The following example shows how to do so:
 
-[source,xml,indent=0]
-[subs="verbatim,quotes"]
+[source,xml,indent=0,subs="verbatim,quotes"]
 ----
 	<?xml version="1.0" encoding="UTF-8"?>
 	<beans xmlns="http://www.springframework.org/schema/beans"

src/docs/asciidoc/data-access/data-access-appendix.adoc

@@ -32,8 +32,7 @@ the following preamble at the top of your Spring XML configuration file. The tex
 following snippet references the correct schema so that the tags in the `tx` namespace
 are available to you:
 
-[source,xml,indent=0]
-[subs="verbatim,quotes"]
+[source,xml,indent=0,subs="verbatim,quotes"]
 ----
 	<?xml version="1.0" encoding="UTF-8"?>
 	<beans xmlns="http://www.springframework.org/schema/beans"
@@ -72,8 +71,7 @@ To use the elements in the `jdbc` schema, you need to have the following preambl
 top of your Spring XML configuration file. The text in the following snippet references
 the correct schema so that the elements in the `jdbc` namespace are available to you:
 
-[source,xml,indent=0]
-[subs="verbatim,quotes"]
+[source,xml,indent=0,subs="verbatim,quotes"]
 ----
 	<?xml version="1.0" encoding="UTF-8"?>
 	<beans xmlns="http://www.springframework.org/schema/beans"