Update stale.yml messages and links

Author: JasonWHowell

.github/workflows/stale.yml

@@ -27,11 +27,14 @@ jobs:
         # start-date: '2021-03-19'
         stale-pr-message: >
           This pull request has been inactive for at least 14 days.
-          If you are finished with your changes, don't forget to sign off. See the [contributor guide](https://review.learn.microsoft.com/help/contribute/contribute-how-to-write-pull-request-automation?branch=main) for instructions.
-                    
-          [Get Help](https://review.learn.microsoft.com/help/contribute/help-options?branch=main)  
+
+          If you are finished with your changes, don't forget to sign off. See the [platform guide](https://review.learn.microsoft.com/help/platform/prmerger-hashtag-commands?branch=main) for instructions.
+             
+          [Get Help](https://review.learn.microsoft.com/help/platform/help-options?branch=main)  
           
-          [Docs Support Teams Channel](https://teams.microsoft.com/l/channel/19%3a7ecffca1166a4a3986fed528cf0870ee%40thread.skype/General?groupId=de9ddba4-2574-4830-87ed-41668c07a1ca&tenantId=72f988bf-86f1-41af-91ab-2d7cd011db47)  
+          [Learn Support Teams Channel](https://teams.microsoft.com/l/channel/19%3a7ecffca1166a4a3986fed528cf0870ee%40thread.skype/General?groupId=de9ddba4-2574-4830-87ed-41668c07a1ca&tenantId=72f988bf-86f1-41af-91ab-2d7cd011db47)  
           
-          [Resolve Merge Conflict](https://review.learn.microsoft.com/help/contribute/resolve-merge-conflicts?branch=main)  
-        
+          [Resolve Merge Conflicts](https://review.learn.microsoft.com/help/contribute/resolve-merge-conflicts?branch=main)  
+        close-pr-message: >
+          This pull request has been inactive for 90 days, and an `auto-close` label has been added. At this time, the system is closing the PR automatically. If you decide to continue working on your changes, scroll to the bottom of the pull request comments and select the **Reopen pull request** button.
+          <br/>