Update project slug in documentation-preview

Author: rffontenelle

.github/workflows/documentation-links.yml

@@ -21,4 +21,4 @@ jobs:
     steps:
       - uses: readthedocs/actions/preview@v1
         with:
-          project-slug: "python-docs-tx-translations"
+          project-slug: "python-docs-transifex-automation"