Improve comments

scripts/release/workflow/prepare-release-merge.sh

@@ -18,6 +18,7 @@ git merge origin/master -m "Merge master to $GITHUB_REF_NAME" -X theirs || true
 
 # When files were modified in the release branch but removed in master, git will not finish the merge
 # and will leave the files in the index. We need to remove them manually.
+# --diff-filter=U - Only unmerged files
 git diff --name-only --diff-filter=U | xargs git rm
 
 # Remove the originally deleted changesets to correctly sync with master