docs(file-upload): add file validators section

[thiagomini]

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• 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:

Does this PR introduce a breaking change?

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Other information

This Docs change is related to this PR which adds FileValidators

[thiagomini]

@kamilmysliwiec pinging you here for visibility

[jmcdo29]

LGTM. Is there a way we could better type file in the FileValidator?

[thiagomini]

LGTM. Is there a way we could better type file in the FileValidator?

Yea, I also thought about it.. the problem is that usually we can't reference Multer type on NestJS package and create a dependency. I had a discussion about that with Kamil but I can't find the original PR now 🤔 anyway, the final solution was to type it as any, but there might be a better solution, maybe with generics? I can work on that @jmcdo29

[jmcdo29]

Possibly just a hint on the docs could suffice, about what could be used and how to import it, but make it clear that this is just an option

[thiagomini]

@jmcdo29 type hint added, line 111.

[thiagomini]

@kamilmysliwiec I think I resolved all issues pointed out, would you mind to review again?

[kamilmysliwiec]

LGTM

[kamilmysliwiec]

Any chance you can rebase to the 9.0.0 branch? @thiagomini 🙌

[thiagomini]

Done @kamilmysliwiec

[kamilmysliwiec]

LGTM @thiagomini thanks!