Update pr_comment.yml

Author: logankilpatrick

.github/workflows/pr_comment.yml

@@ -10,5 +10,5 @@ jobs:
         if: github.event_name == 'pull_request' && github.repository == github.event.pull_request.head.repo.full_name # if this is a pull request build AND the pull request is NOT made from a fork
         uses: thollander/actions-comment-pull-request@71efef56b184328c7ef1f213577c3a90edaa4aff
         with:
-          message: 'Once the build has completed, you can preview any updated documentation at this URL: https://fluxml.ai/Flux.jl/previews/previews/PR${{ github.event.number }}/ in ~20 minutes'
+          message: 'Once the build has completed, you can preview any updated documentation at this URL: https://fluxml.ai/Flux.jl/previews/PR${{ github.event.number }}/ in ~20 minutes'
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}