Add 13.11 Introduction to WebIDE Deeplink docs

doc/user/project/repository/web_editor.md

@@ -58,6 +58,9 @@ to display, add a file to your repository.
 
 ## Highlight lines
 
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/56159) in GitLab 13.10 for GitLab SaaS instances.
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/56159) in GitLab 13.11 for self-managed instances.
+
 Web Editor enables you to highlight a single line by adding specially formatted
 hash information to the URL's file path segment. For example, the file path segment
 `MY_FILE.js#L3` instructs the Web Editor to highlight line 3.