kern/58623: KASSERT(9) man page is vague about what header file it needs

[campbell+netbsd%mumble.net@localhost]

>Number:         58623
>Category:       kern
>Synopsis:       KASSERT(9) man page is vague about what header file it needs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          doc-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Aug 20 23:40:01 +0000 2024
>Originator:     Taylor R Campbell
>Release:        current, 10, 9, ...
>Organization:
The KNETBSD(9) Foundation
>Environment:
>Description:
The KASSERT(9) man page doesn't say what header file you're supposed to include to get at it.
>How-To-Repeat:
rtfm
>Fix:
Yes, please!

Obvious candidates:

#include <lib/libkern/libkern.h>
#include <sys/systm.h>

I don't like either of these, really -- hodgepodge piles of miscellany like this shouldn't exist; header files should have clear definite purposes with limited scope.  But one of those is probably the right thing to document for now.