[PR docs message] Update saying available for 30 days (#463)

* [PR docs message] Update saying available for 30 days

* change msg

Author: mishig25

.github/workflows/upload_pr_documentation.yml

@@ -122,7 +122,7 @@ jobs:
         if: steps.find_comment.outputs.comment-id == ''
 
         with:
-          message: 'The docs for this PR live [here](${{ steps.hfhub-context.outputs.hub_docs_url }}). All of your documentation changes will be reflected on that endpoint.'
+          message: 'The docs for this PR live [here](${{ steps.hfhub-context.outputs.hub_docs_url }}). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.'
           pr_number: ${{ steps.github-context.outputs.pr_number }}
           GITHUB_TOKEN: ${{ secrets.comment_bot_token }}
 
@@ -134,4 +134,4 @@ jobs:
           token: ${{ secrets.comment_bot_token }}
           edit-mode: replace
           body: |
-            The docs for this PR live [here](${{ steps.hfhub-context.outputs.hub_docs_url }}). All of your documentation changes will be reflected on that endpoint.
+            The docs for this PR live [here](${{ steps.hfhub-context.outputs.hub_docs_url }}). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.