BUG #11474: [Documentation] Add a note about to_date() not accepting TM modifier

The following bug has been logged on the website:

Bug reference:      11474
Logged by:          Goulven Guillard
Email address:      lecotegougdelaforce@free.fr
PostgreSQL version: 9.3.5
Operating system:   Fedora 20
Description:

Hi,

The issue about to_date() and to_timestamp() not accepting localized month
and day names is still on the TODO list.  However, reading the documentation
about data type formatting functions, one would expect the TM modifier to be
effective.  A note should be added to the already existing list of usage
notes to make it clear.

Thanks.

Regards,

Goulven.