doc: add TODO comment for approvals check to commit-queue workflow

Author: dario-piotrowicz

.github/workflows/commit-queue.yml

@@ -32,6 +32,7 @@ jobs:
     steps:
       - name: Get Pull Requests
         id: get_mergeable_prs
+        # TODO: the filtering below also check for the correct number of approvals
         run: |
           prs=$(gh pr list \
                   --repo ${{ github.repository }} \