Docs for read_html : parse_dates
`parse_dates` should have a little more documentation (I did look at docs on read_csv as well).

It is not clear to me what the default value of parse_dates is.

Alson on read_html is listed as "bool" whereas on read_csv as "boolean, list of ints or names, list of lists, or dict".

I am not sure what setting parse_dates=False does.
