docs: Remove Preview callouts for stable release (#50119)

This PR removes Preview callouts from documentation for features that
are now in Stable.

Features documented with Preview callouts are now included in the stable
release.

Generated by script/docs-strip-preview-callouts

Release Notes:

- N/A

docs/src/finding-navigating.md

@@ -19,8 +19,6 @@ Open any file in your project with {#kb file_finder::Toggle}. Type part of the f
 
 ## Project Search
 
-> **Changed in Preview (v0.225).** See [release notes](/releases#0.225).
-
 Search across all files with {#kb pane::DeploySearch}. Start typing in the search field to begin searching—results appear as you type.
 
 Results appear in a [multibuffer](./multibuffers.md), letting you edit matches in place.