Add Independent Agent Release doc

reference/fleet/fleet-agent-release-process.md

@@ -9,10 +9,12 @@ products:
 
 # {{agent}} release process [fleet-agent-release-process]
 
+## Scheduled releases
+
 {{agent}} follows a release process aligned with the broader {{stack}} release schedule. The latest features, enhancements, and fixes are documented in the [release notes](../../release-notes/fleet-elastic-agent/index.md).
 
-## Independent agent release
+## Independent {{agent}} releases
 
-The independent agent release (IAR) is a hotfix release process for {{agent}} and {{elastic-defend}}, designed to deliver critical fixes and updates independently of the full stack release. The IAR process is more conservative than a typical patch release, and only modifies the specific {{agent}} components needed for a targeted fix. For example, an IAR hotfix release for {{elastic-defend}} would only change the endpoint-security executable, with the remaining executables being exactly those released in the previous patch.
+Independent {{agent}} releases deliver critical fixes and updates for {{agent}} and {{elastic-defend}}, independently of the full stack release. This is a more conservative process than a typical patch release, and only modifies the specific {{agent}} components needed for a targeted fix. For example, an independent {{agent}} hotfix release for {{elastic-defend}} would only change the endpoint-security executable, with the remaining executables being exactly those released in the previous patch.
 
-The IAR version format appends a build identifier in the format `+build{yyyymmddhhmm}` to the semantic version it is based on, where `{yyyymmddhhmm}` is the release timestamp of the build.
+In independent {{agent}} releases, the version format appends a build identifier in the format `+build{yyyymmddhhmm}` to the semantic version it is based on, where `{yyyymmddhhmm}` is the release timestamp of the build.

reference/fleet/upgrade-elastic-agent.md

@@ -80,7 +80,7 @@ With the right [subscription level](https://www.elastic.co/subscriptions), you c
 
 3. In the Upgrade agent window, select or specify an upgrade version and click **Upgrade agent**.
 
-    {{kib}} provides a list of the {{agent}} versions available for upgrade. A version number ending with a build identifier in the format `+build{yyyymmddhhmm}` indicates an [independent agent release version](./fleet-agent-release-process.md#independent-agent-release).
+    {{kib}} provides a list of the {{agent}} versions available for upgrade. A version number ending with a build identifier in the format `+build{yyyymmddhhmm}` indicates an [independent agent release version](./fleet-agent-release-process.md#independent-agent-releases).
 
     In certain cases, the latest available {{agent}} version may not be recognized by {{kib}}. For instance, this occurs when the {{kib}} version is lower than the {{agent}} version. You can specify a custom version for {{agent}} to upgrade to by entering the version into the **Upgrade version** text field.