K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2019-03-13T17:30:03.487406Z
K 7
svn:log
V 386
Some fixes for proccontrol(1) man page.

- Fix markup.
- Mention that process can only allow tracing for itself.  This is already
  stated in procctl(2), but requiring knowledge of the syscall description
  is too much for the tool user.
- Clearly state that query mode only works for existing process.

Noted and reviewed by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	3 days

END