ci: Clarify that diffchecks fails until a number is assigned

.github/workflows/github-action-checks.yml

@@ -13,6 +13,7 @@ jobs:
       - uses: actions/checkout@v4
       - run: scripts/buildtable.pl >/tmp/table.mediawiki || exit 1
   Diff-Checks:
+    name: "Diff Checks (fails until number assignment)"
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4