docs: BrowserSupport guide for CLI

[wardbell]

Issue #19510

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

[mary-poppins]

You can preview 93b8cc0 at https://pr19843-93b8cc0.ngbuilds.io/.

[angular-automatic-lock-bot]

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