update preview comment

Author: jotak

.github/workflows/surge-deploy-preview.yml

@@ -41,8 +41,8 @@ jobs:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           pr-number: ${{ steps.pr.outputs.id }}
           body: |
-            🚀 PR Preview for **blog** ${{ github.sha }} has been successfully built!
-            * https://netobserv-io-blog-${{ steps.pr.outputs.id }}-preview.surge.sh
+            🚀 PR Preview for netobserv.io has been successfully deployed!
+            It's available at https://netobserv-io-blog-${{ steps.pr.outputs.id }}-preview.surge.sh and will be removed when the PR closes.
           body-marker: <!-- Preview status comment marker -->
 
       - name: Update PR status comment on failure