Add missing ref docs to tmp_path and tmp_path_factory

[nicoddemus]

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[nicoddemus]

Docs passed already, so merging. 👍

[blueyed]

@nicoddemus
btw: at least with Travis we could skip jobs/stages based on commit message content, e.g. skip tests.

[blueyed]

(OTOH that is bad then when merging, where the base coverage might be missing then)

[nicoddemus]

we could skip jobs/stages based on commit message content, e.g. skip tests

I guess you mean we could implement this logic in our .travis.yml file.

I'm not sure it will save us much because the builds now are quite faster, plus I guess most people contributing docs won't know about the skip tests trick... I don't know. 🤷‍♂️