Update style for rule fail/pass examples

[sindresorhus]

See #2529

I don't want lots of pull requests, so if you want to contribute, you have to do them all.

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Enable this again when this is done:

eslint-plugin-unicorn/test/package.js

Lines 145 to 147 in 41a7644

	// TODO: Disabled until https://github.com/sindresorhus/eslint-plugin-unicorn/issues/2530 is done.
	// Check for examples.
	// t.true(documentContents.includes('## Examples'), `${ruleName} includes '## Examples' examples section`);

[fregante]

you have to do them all.

With 100+ rules that would be prohibitive even just to review. Let's say at least 20/30 rules

[sindresorhus]

Sure