build: update docs action

Author: mrholek

.github/workflows/docs.yml

@@ -44,7 +44,7 @@ jobs:
       - name: Run linkinator
         uses: JustinBeckwith/linkinator-action@v1
         with:
-          paths: _gh-pages
+          paths: _gh_pages
           recurse: true
           verbosity: error
           skip: "^(?!http://localhost)"