First attempt at testing for descriptors

What does this MR do?

Attempts to start building a suggestion-level test for some of the new guidance re: descriptors we've added to the style guide. 'Area' needs some work - we need to think about how to handle textarea / text area and add that in, so we don't get false positives.

• https://docs.gitlab.com/ee/development/documentation/styleguide/word_list.html#button
• https://docs.gitlab.com/ee/development/documentation/styleguide/word_list.html#section

Related issues

Author's checklist

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