message: docs: add yarn build fail workaround on windows
  PR Close
diff: @@ -22,7 +22,9 @@ Before you can build and test Angular, you must install and configure the
  following products on your development machine:
  * [Git](https://git-scm.com/) and/or the [**GitHub app**](https://desktop.github.com/) (for Mac and Windows);
  - [GitHub's Guide to Installing Git](https://help.github.com/articles/set-up-git) is a good source of information.
  + [GitHub's Guide to Installing Git](https://help.github.com/articles/set-up-git) is a good source of information.\
  + **Windows Users**: Git Bash or an equivalent shell is required\
  + *Windows Powershell and cmd shells are not supported [#46780](https://github.com/angular/angular/issues/46780) so some commands might fail*
  * [Node.js](https://nodejs.org), (version specified in the engines field of [`package.json`](../package.json)) which is used to run a development web server,
  run tests, and generate distributable files.
  