Remove stray lines

I snagged the license boiler plate. Fix that. also, it's spelled .Va
not .Vn. Plus " quoting issues.

Noticed by: rgrimes, xtouqh at hotmail dot com

Add devctl_notify(9) man page

Document the calls to send messages to userland via devctl.
devctl_notify will create a message for the specified system,
subsystem and type, optionally adding addition

Add devctl_notify(9) man page

Document the calls to send messages to userland via devctl.
devctl_notify will create a message for the specified system,
subsystem and type, optionally adding additional information.

Reviewed by: bcr
Differential Revision: https://reviews.freebsd.org/D26520

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