gfileinfo: Clarify units in documentation for file attributes
gfileinfo: Clarify units in documentation for file attributes

Clarify that the G_FILE_ATTRIBUTE_TIME_* attributes are all in seconds
(apart from the *_USEC ones, which are documented separately).

endlessm/glib,endlessm/glib,endlessm/glib,johne53/MB3Glib,endlessm/glib,johne53/MB3Glib,endlessm/glib,johne53/MB3Glib,johne53/MB3Glib,johne53/MB3Glib,johne53/MB3Glib