adjust documentation for ktrace.h changes. utrace() is now easier to use
ok guenther

The include of sys/ktrace.h will require sys/types.h, so document this.

neither ktrace(2) or utrace(2) require a caller to pull sys/param.h

Add utrace(2), a system call allowing for userland to send its own ktrace
records. From FreeBSD via otto@, with tweaks suggested by guenther@.
Commite on behalf of otto@ who is not around, to ride th

Add utrace(2), a system call allowing for userland to send its own ktrace
records. From FreeBSD via otto@, with tweaks suggested by guenther@.
Commite on behalf of otto@ who is not around, to ride the libc minor bump.
Causes a librthread minor bump as well (new syscall).

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