Update README.md

Minor changes to readme.md

Author: markweitzel

azure/README.md

@@ -5,7 +5,7 @@ Designing powerful APIs with strong defaults, consistent behavior across related
 * [Considerations for Service Design](ConsiderationsForServiceDesign.md)
 * [REST API Guidelines](Guidelines.md)
 * [OpenAPI Style Guidelines](https://github.com/Azure/azure-api-style-guide/blob/main/README.md)
-* [Breaking Changes](http://aka.ms/AzBreakingChangesPolicy/)
+* [Breaking Changes](http://aka.ms/AzBreakingChangesPolicy/) <sub>Note: Internal Microsoft link</sub>
 
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