sandbox manual page description of sandbox types does not match usage

[mikedlr]

Currently the sandbox manual page wrongly describes at least two of the contexts

sandbox_x_t \-  Printer Ports

sandbox_net_t   \-  All network ports

actually sandbox_x_t is for X windows, sandbox_net_t seems to block outgoing connections and there is an additional sandbox_net_client_t which seems to allow outgoing network connections.

N.B. The definition of the sandbox seems clearest in this selinux manual page. Confirmation that sandbox_net_t isn't meant to give full network access can be gleaned from this bugzilla ticket

[mikedlr]

My proposed change has been merged. Thanks.