Update pull_request_template.md (#6494)

Add links to .NET Aspire docs - issue templates.

Author: IEvangelist

.github/pull_request_template.md

@@ -29,5 +29,9 @@ Fixes # (issue)
   - [ ] No
 - Does the change require an update in our Aspire docs?
   - [ ] Yes
-    - Link to aspire-docs issue: 
+    - Is this introducing a breaking change?
+      - [ ] Yes
+        - Link to aspire-docs issue (please use this [`breaking-change` template](https://github.com/dotnet/docs-aspire/issues/new?template=04-breaking-change.yml)):
+      - [ ] No
+        - Link to aspire-docs issue (please use this [`doc-idea` template](https://github.com/dotnet/docs-aspire/issues/new?template=02-docs-request.yml)):
   - [ ] No