message: docs(aio): update `yarn test` command in README.md
  PR Close
diff: @@ -22,7 +22,8 @@ Here are the most important tasks you might need to use:
  * `yarn start` - run a development web server that watches the files; then builds the doc-viewer and reloads the page, as necessary.
  * `yarn serve-and-sync` - run both the `docs-watch` and `start` in the same console.
  * `yarn lint` - check that the doc-viewer code follows our style rules.
  -* `yarn test` - watch all the source files, for the doc-viewer, and run all the unit tests when any change.
  +* `yarn test` - run all the unit tests once.
  +* `yarn test --watch` - watch all the source files, for the doc-viewer, and run all the unit tests when any change.
  * `yarn e2e` - run all the e2e tests for the doc-viewer.
  * `yarn docs` - generate all the docs from the source files.
  