kern/41341: callout_halt is not documented

[martin%duskware.de@localhost]

>Number:         41341
>Category:       kern
>Synopsis:       callout(9) does not document callout_halt()
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          doc-bug
>Submitter-Id:   net
>Arrival-Date:   Sat May 02 22:10:01 +0000 2009
>Originator:     Martin Husemann
>Release:        NetBSD 5.99.11
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD sunny-weather.duskware.de 5.99.11 NetBSD 5.99.11 (SUNNY.MP) 
#148: Sat May 2 23:59:55 CEST 2009 
martin%sunny-weather.duskware.de@localhost:/usr/src/sys/arch/sparc64/compile/SUNNY.MP
 sparc64
Architecture: sparc64
Machine: sparc64
>Description:

The callout_halt() function is important before destroying a callout in
some environements, yet it is not documented.

>How-To-Repeat:
man callout
>Fix:
n/a