fix(informative-docs): trim description text

[JoshuaKGoldberg]

Right now, informative-docs isn't trimming the text it passes to are-docs-informative. The Boolean(text) check that's supposed to filter out blank text isn't accounting for whitespace. That means when there's a tag like @class, it calls the equivalent of:

areDocsInformative('\n', 'MyAmazingThing')

...which is false.

This .trim()s the text so that whitespace is ignored.

Fixes #1039.

[brettz9]

Thanks for this... If you could also take a look at #1041 , @JoshuaKGoldberg ?

[github-actions]

🎉 This PR is included in version 43.0.8 🎉

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