[arch-general] ssd trim using fstrim.service and fstrim.timer

[Francis Gerund]

hello.

Per the Arch wiki SSD page, I just enabled sysctl fstrim.timer, and then
rebooted.  I did not "enable" fstab.service.  Now fstrim.timer is loaded,
and active (but "waiting") and fstrim.service is loaded, but inactive.  And
the time stamp file the wiki mentions has a "0" size.

So, do I have to wait (A WEEK!) to see if it works, or can I somehow now
run fstrim.service manually to at least get it done once?

Note: I could just add "discard" to /etc/fstab, but wouldn't that wear out
the SSD faster than periodic trimming?

And yes, my SSD does support trimming.