gmmproc: Don't change NULL to 0 in docs, when it's part of a longer name

* tools/pm/DocsParser.pm: Don't change NULL to 0, TRUE to true,
FALSE to false, when they are part of a longer name.
Regenerate gio_methods.defs

* gio/src/gio_methods.defs: Some inconsistent parameter names have been fixed
in glib/gio header files.
Fix some doxygen warnings

* gio/src/action.hg:
* gio/src/actionmap.hg:
* gio/src/dbusconnection.hg:
* gio/src/dbusproxy.hg:
* gio/src/file.hg:
* gio/src/fileinfo.hg:
* gio/src/menuitem.hg:
* gio/src/mount.hg:
* gio/src/settings.hg:
* gio/src/simpleaction.hg:
* gio/src/threadedsocketservice.hg:
* glib/glibmm/base64.h:
* glib/glibmm/refptr.h:
* glib/src/variant.hg: Fix some warnings in doxygen.log.