Recommend that a Gitlab issue is added to commit messages

MR: gitlab.com/gitlab-org/gitlab/-/merge_requests/48986

doc/topics/gitlab_flow.md

@@ -311,6 +311,18 @@ The words "change," "improve," "fix," and "refactor" don't add much information
 For example, "Improve XML generation" could be better written as "Properly escape special characters in XML generation."
 For more information about formatting commit messages, please see this excellent [blog post by Tim Pope](https://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html).
 
+To add more context to a commit message, consider adding information regarding the
+origin of the change. For example, the URL of a GitLab issue, or a Jira issue number,
+containing more information for users who need in-depth context about the change.
+
+For example:
+
+```plaintext
+Properly escape special characters in XML generation.
+
+Issue: gitlab.com/gitlab-org/gitlab/-/issues/1
+```
+
 ## Testing before merging
 
 ![Merge requests showing the test states: red, yellow, and green](img/gitlab_flow_ci_mr.png)