[issue15569] Doc doc: incorrect description of some roles as format-only

[Emily Zhao]

Emily Zhao added the comment:

I moved the 3 misplaced roles (envvar, keyword, and option) and changed the description for the new section per Terry's suggestions. Patch is attached and needs to go in the devguide repo.

https://docs.python.org/devguide/docquality.html#helping-with-the-developers-guide

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keywords: +patch
nosy: +emily.zhao
Added file: http://bugs.python.org/file35517/issue15569.patch

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