Building glib docs

[Russell Shaw <rjshaw netspace net au>]

Hi,
With glib from cvs, i added a function to glib/glib/ghash.c
and glib/glib/ghash.h and did ./configure --enable-gtk-doc
then make.

glib/docs/reference/glib/tmpl/hash_tables.sgml did not
get updated. So, i added to it manually, but the next
build regenerated the file without the changes.
How do i get it to work? Also, how can i just build
the docs without rebuilding the rest of glib?