Bug#674755: Document actual tmpfs-systemd behaviour

[Javier Barroso]

Helllo,

Replying to :

"
I read that like exactly the same expectation?
see also man tmpfs
" at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=674755#68

I think should be fine to document how tmpfs work with systemd. So
when you read tmpfs manpage in a system which is running systemd, you
can config whatever you want.

Current tmpfs only talk about /etc/default/tmpfs file, so after
running systemd as pid 1, it is obsolete, is not ?

Thread at debian-user:
https://lists.debian.org/debian-user/2014/07/msg01306.html

Regards,