docs(faq): elaborate on dep missing errors regarding type-only imports

[micalevisk]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/docs.nestjs.com/blob/master/CONTRIBUTING.md

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
• Docs
• Other... Please describe:

What is the current behavior?

isn't that clear that import type might lead to dependency errors like the ones that happen for circular imports. New typescript users usually didn't get that as we have been seeing on our Discord server

new behavior

Does this PR introduce a breaking change?

• Yes
• No

Other information