docs: fix typos

[Lioness100]

PR Checklist

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

PR Type

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
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This PR fixes a few typos (a trial run for a CLI I made)

Does this PR introduce a breaking change?

• Yes
• No

I'm not sure, I did rename a file.

[Lioness100]

Also, CONTRIBUTING.md says

• We follow [Google's JavaScript Style Guide][js-style-guide], but wrap all code at 100 characters. An automated formatter is available (npm run format).

However that script doesn't seem to exist.