docs(bazel): document an installation issue

[alexeagle]

observed by Igor on a Mac

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)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] angular.io application / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[IgorMinar]

otherwise lgtm

[IgorMinar]

I think the is more suitable for a FAQ section at the bottom of this page. It's unlikely that someone will encounter this particular problem during installation of bazel.

[IgorMinar]

lgtm, please squash and send for merge.

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