Docstring: pd.to_datetime (issue #9107)
Following the issue "to_datetime returns NaT for old dates with coerce=True".

Do I understand correctly that online documentation is build automatically from docstrings? I.e. are there any other files to change?

Also it would be good to make a link to [this section of "Caveats and Gotchas"](http://pandas.pydata.org/pandas-docs/version/0.15.0/gotchas.html#timestamp-limitations), but I'm not sure if the docstring is a good place to do this.
