Update gh-pages workflow to match output dir name

Author: st0012

.github/workflows/gh-pages.yml

@@ -30,10 +30,11 @@ jobs:
         id: pages
         uses: actions/configure-pages@v5
       - name: Build with IRB
-        # Outputs to the './_site' directory by default
         run: bundle exec rake rdoc
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
+        with:
+          path: "docs/"
 
   deploy:
     environment: