Too many backslashes stripped in documentation generation
I've noticed the generated documentation for [to_csv](http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.to_csv.html) strips backslashes in the newline character

> line_terminator : string, default ‘n’

I thought it was a case of slash stripping, but I checked [the code](https://github.com/pydata/pandas/blob/master/pandas/core/frame.py#L1346) and it's double backslashed there - so the doc generation is a bit aggressive. The [IO doc](http://pandas.pydata.org/pandas-docs/stable/io.html#writing-to-csv-format) is fine, [its code](https://github.com/pydata/pandas/blob/master/doc/source/io.rst) is the same - double backslashed.
