Adjust comment text to call out Pages build time

Author: rossjrw

action.yml

@@ -147,8 +147,8 @@ runs:
         message: |
           [PR Preview Action](https://github.com/${{ github.action_repository }}) ${{ env.action_version }}
           :---:
-          :rocket: Deployed preview to https://${{ env.pages_base_url }}/${{ env.preview_url_path }}/
-          on branch [`${{ inputs.preview-branch }}`](${{ github.server_url }}/${{ inputs.deploy-repository }}/tree/${{ inputs.preview-branch }}) at ${{ env.action_start_time }}
+          :rocket: View preview at ${{ env.preview_url }} <br> (after the GitHub Pages build finishes)
+          built to branch [`${{ inputs.preview-branch }}`](${{ github.server_url }}/${{ inputs.deploy-repository }}/tree/${{ inputs.preview-branch }}) at ${{ env.action_start_time }}
 
     - name: Remove preview directory
       if: env.deployment_action == 'remove'