Merged PR 22125: Removing mention of UWP apps from ContentIndex class page

Removing mention of UWP apps from ContentIndex class page

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#### AI description  (iteration 1)
#### PR Classification
Documentation update.

#### PR Summary
This PR revises the ContentIndexer documentation by replacing "UWP apps" with "Windows apps" in the description.
- `windows.storage.search/contentindexer.md`: Updated the description to reference Windows apps.
<!-- GitOpsUserAgent=GitOps.Apps.Server.pullrequestcopilot -->

Author: drewbatgit

windows.storage.search/contentindexer.md

@@ -11,7 +11,7 @@ public class ContentIndexer : Windows.Storage.Search.IContentIndexer, Windows.St
 
 ## -description
 
-Enables UWP apps to make private content searchable by using the system index.
+Enables Windows apps to make private content searchable by using the system index.
 
 ## -remarks