Change repo location for the vale github action (#916)

Author: Chris Cho

.github/workflows/vale-tdbx.yml

@@ -20,8 +20,7 @@ jobs:
       - name: checkout-latest-rules
         uses: actions/checkout@master
         with:
-          repository: 10gen/mongodb-vale
-          ref: tdbx-rules
+          repository: mongodb/mongodb-vale-action
           path: './vale/styles'
           token: ${{secrets.GITHUB_TOKEN}}