[DOCS] Updates terminology for alerting features (#43945)

Author: lcawl

x-pack/docs/en/watcher/gs-index.asciidoc

@@ -37,10 +37,10 @@ All of these use-cases share a few key properties:
   3rd party system is notified, or the query results are stored.
 
 [float]
-=== How Watches Work
+=== How watches work
 
-{xpack} provides an API for creating, managing and testing _watches_. A watch
-describes a single alert and can contain multiple notification actions.
+The {alert-features} provide an API for creating, managing and testing _watches_.
+A watch describes a single alert and can contain multiple notification actions.
 
 A watch is constructed from four simple building blocks:
 

x-pack/docs/en/watcher/index.asciidoc

@@ -3,7 +3,7 @@
 
 [partintro]
 --
-{xpack} alerting is a set of administrative features that enable you to watch
+The {alert-features} enable you to watch
 for changes or anomalies in your data and perform the necessary actions in
 response. For example, you might want to:
 
@@ -38,10 +38,10 @@ All of these use-cases share a few key properties:
   3rd party system is notified, or the query results are stored.
 
 [float]
-=== How Watches Work
+=== How watches work
 
-{xpack} provides an API for creating, managing and testing _watches_. A watch
-describes a single alert and can contain multiple notification actions.
+The {alert-features} provide an API for creating, managing and testing _watches_.
+A watch describes a single alert and can contain multiple notification actions.
 
 A watch is constructed from four simple building blocks:
 

x-pack/docs/en/watcher/trigger/schedule/cron.asciidoc

@@ -1,5 +1,5 @@
 [[schedule-cron]]
-==== `cron` Schedule
+==== `cron` schedule
 
 A <<trigger-schedule, `schedule`>> trigger that enables you to use a
 https://en.wikipedia.org/wiki/Cron[cron] style expression to specify when you
@@ -213,7 +213,8 @@ minute during the weekend:
 [[croneval]]
 ===== Verifying Cron Expressions
 
-{xpack} ships with a `elasticsearch-croneval` command line tool that you can use to verify that
+The {es} {alert-features} provide a `elasticsearch-croneval` command line tool
+that you can use to verify that
 your cron expressions are valid and produce the expected results. This tool is
 provided in the `$ES_HOME/bin` directory.