perf archive: Add documentation

This also makes it appear on the 'perf --help' output, i.e.
util/generate-cmdlist.sh now takes it into account.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1263837559-24168-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/tools/perf/command-list.txt b/tools/perf/command-list.txt
index f73d1d9..cf6444d 100644
--- a/tools/perf/command-list.txt
+++ b/tools/perf/command-list.txt
@@ -3,7 +3,7 @@
 # command name			category [deprecated] [common]
 #
 perf-annotate			mainporcelain common
-perf-archive			mainporcelain
+perf-archive			mainporcelain common
 perf-bench			mainporcelain common
 perf-buildid-list		mainporcelain common
 perf-diff			mainporcelain common