docs: Remove item from list that does not work

After investigation, the animation completions do not work so the feature should be removed from the changelog.

Author: atscott

CHANGELOG.md

@@ -16,7 +16,6 @@ This release upgrades `@angular/language-service` to v13.2.0.
 
 * feat(server): Definitions for sources compiled with `declarationMap` go to
   original source
-* feat(language-service): support completions for animation (https://github.com/angular/angular/pull/44630)
 
 
 # v13.1.0