[v3] locale docs

[Benjamin Kosnik]

>2003-12-19  Jerry Quinn  <jlquinn@optonline.net>
>
>	* docs/doxygen/TODO: Update.
>	* include/bits/locale_classes.h (locale, facet, id): Document.
>	* include/bits/locale_facets.tcc (has_facet, use_facet): Document.

Looks good, thanks.