docs: clarify Node.js version (angular#53581)

Resolve angular#53334

PR Close angular#53581

docs/DEVELOPER.md

@@ -26,8 +26,9 @@ following products on your development machine:
   **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.
+* [Node.js](https://nodejs.org), (version specified in [`.nvmrc`](../.nvmrc)) which is used to run a development web server,
+  run tests, and generate distributable files.  
+  `.nvmrc` is read by [nvm](https://github.com/nvm-sh/nvm) commands like `nvm install` and `nvm use`.
 
 * [Yarn](https://yarnpkg.com) (version specified in the engines field of [`package.json`](../package.json)) which is used to install dependencies.