Fix grammar issue [ci skip]

Closes #31018

RELEASING_RAILS.md

@@ -141,7 +141,7 @@ lists where you should announce:
 Use Markdown format for your announcement. Remember to ask people to report
 issues with the release candidate to the rails-core mailing list.
 
-NOTE: For patch releases there's a `rake announce` task to generate the release
+NOTE: For patch releases, there's a `rake announce` task to generate the release
 post. It supports multiple patch releases too:
 
 ```