message: docs: Add v15 release blog post link to changelog
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diff: <a name="15.0.0"></a>
  # 15.0.0 (2022-11-16)
  +
  +[Blog post "Angular v15 is now available"](http://goo.gle/angular-v15).
  +
  ## Breaking Changes
  ### compiler
  - Keyframes names are now prefixed with the component's "scope name".
  