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/git.md

@@ -72,8 +72,6 @@ To disable word diff for specific languages only, add this to your settings.json
 
 ### Diff View Styles
 
-> **Changed in Preview (v0.225).** See [release notes](/releases#0.225).
-
 Zed displays diffs in two modes: **split** (side-by-side comparison) or **unified** (inline changes). Split view is the default.
 
 #### Changing the diff view