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/reference/cli.md

@@ -71,8 +71,6 @@ zed -n ~/projects/myproject
 
 ### `-a`, `--add`
 
-> **Changed in Preview (v0.225).** See [release notes](/releases#0.225).
-
 Add paths to the currently focused workspace instead of opening a new window. When multiple workspace windows are open, files open in the focused window:
 
 ```sh