docs: add terminus v11 migration guide

[BrunnerLivio]

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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)
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Description

Documentation update for Terminus v11, related nestjs/terminus#2570, nestjs/terminus#2571

[Tony133]

Suggested change

	private getBadboys() { // ... }
	private getBadboys() {
	// ...
	}

[BrunnerLivio]

I wanted to save some space :)

[Tony133]

I wanted to save some space :)

😄, Alternatively, it can be done like this:

private getBadboys() { ... }