FIX Handle param names ending in underscore

[jnothman]

This issue results from #107: the explicit bold styling was removed because Sphinx definition lists bolded the term by default. However, without ** surrounding param name, a name like word_ was being treated as a link.

In an alternative patch, #144, I reported that "I also attempted to replace the _ with \_ but found that the backslashes showed in the HTML." I don't see that now, at least in rendering the numpydoc docs. I will confirm that this patch fixes the issue in scikit-learn docs.

[jnothman]

Not happy. The \s are showing in scikit-learn rendered docs, even when they don't if I include attributes ending _ in numpydoc's example.py and just render them. No idea why. Might go back to #144 :\

[jnothman]

What I said above was erroneous. The escaping backslashes do show in numpydoc. It is a bug in docutils (See scikit-learn/scikit-learn#10444 (comment)), fixed in the unreleased v0.15 (r8197), which I assume will not be released for some time. We might need to rely on #144 in the meantime.