trace(1): make more like a Plan 9 man page
 [rsc] --rw-rw-r-- M 1942060 presotto sys 1497 Feb 28 12:17 sys/man/1/trace
	[diffs elided - too long]
	[diff -c /n/sourcesdump/2006/0228/plan9/sys/man/1/trace /n/sourcesdump/2006/0301/plan9/sys/man/1/trace]