message: docs: fix public api tool name
  PR Close
diff: @@ -47,10 +47,10 @@ Our peer dependencies (such as TypeScript, Zone.js, or RxJS) are not considered
  <a name="golden-files"></a>
  ## Golden files
  -
  -Angular tracks the status of the public API in a *golden file*, maintained with a tool called the *public API guard*. If you modify any part of a public API in one of the supported public packages, the PR can fail a Circle CI test with failures in `testlogs/tools/public_api_guard`, and an error message that instructs you to accept the golden file.
  -
  -The public API guard provides a Bazel target that updates the current status of a given package. If you add to or modify the public API in any way, you must use [yarn](https://yarnpkg.com/) to execute the Bazel target in your terminal shell of choice (a recent version of `bash` is recommended).
  +Angular tracks the status of the public API in *golden files*. These files are stored in [tools/public_api_guard/](../tools/public_api_guard) and are maintained with a tool called [TS API Guardian](https://www.npmjs.com/package/ts-api-guardian).
  +If you modify any part of a public API in one of the supported public packages, you must update the golden files that track the public API surface.
  +If the golden files are not updated correctly, our test suite will detect the problem and the PR will fail to pass the tests.
  +In such cases, a test error message will provide instructions for a command that updates the golden files.
  ```shell
  yarn bazel run //tools/public_api_guard:<modified_package>_api.accept
  