Patrick H. Lauke 9013c9884e
Docs: add explanation of the base .btn class (#37275)
* Docs: add explanation of the base `.btn` class

and a callout reminding authors to at least define some focus styling if they intend to use it "naked"

* Turn callout into a warning

* Add initial heading

* Tweak callout wording
2023-01-03 11:28:27 +00:00
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