DOC: add data_columns to doc string of to_hdf and HDFStore.append

[jorisvandenbossche]

Follow-up of #13951, rebase of PR #13065

[jorisvandenbossche]

I combined the changes of #13065 with the changes merged in #13951 (found the explanation a bit clearer in #13065), and fixed the formatting

[codecov-io]

Current coverage is 85.25% (diff: 100%)

Merging #14046 into master will not change coverage

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[jorisvandenbossche]

@jreback the way to prevent the need for #noqa in docstrings for long lines (as that is rather strange in the html docs), is to ensure that the too long line consists of only one word/url (so no spaces), then the linter does not complaining.

So in this example, I changed

...
`here <http://pandas.pydata.org/pandas-docs/stable/io.html#query-via-data-columns>`__ # noqa
...

with

... `here 
<http://pandas.pydata.org/pandas-docs/stable/io.html#query-via-data-columns>`__
...

(just letting you know for reviewing purposes :-)) Maybe we should document that somewhere ..

[jreback]

@jorisvandenbossche ahh good to know