Changing GitHub Actions cache documentation (#28228)

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes


Co-authored-by: JJ Kasper <22380829+ijjk@users.noreply.github.com>

errors/no-cache.md

@@ -80,7 +80,10 @@ Using GitHub's [actions/cache](https://github.com/actions/cache), add the follow
 ```yaml
 uses: actions/cache@v2
 with:
-  path: ${{ github.workspace }}/.next/cache
+  # See here for caching with `yarn` https://github.com/actions/cache/blob/main/examples.md#node---yarn or you can leverage caching with actions/setup-node https://github.com/actions/setup-node
+  path: |
+    ~/.npm
+    ${{ github.workspace }}/.next/cache
   # Generate a new cache whenever packages or source files change.
   key: ${{ runner.os }}-nextjs-${{ hashFiles('**/package-lock.json') }}-${{ hashFiles('**.[jt]s', '**.[jt]sx') }}
   # If source files changed but packages didn't, rebuild from a prior cache.