"gio help COMMAND" shows some arguments with "..." and some with "…",
which looks weird, e.g.:
$ gio help mount
gio mount [OPTION…] [LOCATION...]
Let's use "…" consitently.
This command collects the various commandline utilities that
are currently shipped in gvfs, and unifies them under a single,
command-style binary.
The tools just use GIO APIs, so it makes sense for them to live here.