change breaking change check list in PR (Azure#12871)

* change breaking change check list in PR

Update API in preview version over 1 year is not valid now.

* Update PULL_REQUEST_TEMPLATE.md

* Update PULL_REQUEST_TEMPLATE.md

Author: JackTn

.github/PULL_REQUEST_TEMPLATE.md

@@ -40,13 +40,13 @@ If any further question about AME onboarding or validation tools, please view th
 - [ ] If you are blocked on ARM review and want to get the PR merged with urgency, please get the ARM oncall for reviews (*RP Manifest Approvers* team under <ins>Azure Resource Manager service</ins>) from IcM and reach out to them. 
 
 ### Breaking Change Review Checklist 
-If there are following updates in the PR, ensure to request an approval from API Review Board as defined in the [Breaking Change Policy](http://aka.ms/bcforapi). 
+If there are following updates in the PR, ensure to request an approval from Breaking Change Review Board as defined in the [Breaking Change Policy](http://aka.ms/bcforapi). 
 
 - [ ] Removing API(s) in stable version
 - [ ] Removing properties in stable version
 - [ ] Removing API version(s) in stable version
-- [ ] Updating API in stable version with Breaking Change Validation errors
-- [ ] Updating API(s) in preview over 1 year
+- [ ] Updating API in stable or public preview version with Breaking Change Validation errors
+- [ ] Updating API(s) in public preview over 1 year (refer to [Retirement of Previews](https://dev.azure.com/msazure/AzureWiki/_wiki/wikis/AzureWiki.wiki/37683/Retirement-of-Previews))
 
 **Action**: to initiate an evaluation of the breaking change, create a new intake using the [template for breaking changes](https://aka.ms/Breakingchangetemplate). Addition details on the process and office hours are on the [Breaking change Wiki](https://dev.azure.com/msazure/AzureWiki/_wiki/wikis/AzureWiki.wiki/37684/Breaking-Changes).