docs(angular/overview): guard the error with 'isError()', rename the 'Response' interface to 'Repo', and remove the unused 'CommonModule' import (#12183)

An automatically generated fix could have been available for this error, but the fix-ci step hasn't completed. Ensure it's configured to always run in your CI pipeline to get automatic fixes in future runs. For more information, see the Self-Healing CI docs.