There're no descriptions about how to use perf trace with options and commands 
on the man page, so detail usages

Cc: Jiri Olsa <jo...@kernel.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Taeung Song <treeze.tae...@gmail.com>
Signed-off-by: Sangwon Hong <qpa...@gmail.com>
---
 tools/perf/Documentation/perf-trace.txt | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-trace.txt 
b/tools/perf/Documentation/perf-trace.txt
index 33a88e9..2608d16 100644
--- a/tools/perf/Documentation/perf-trace.txt
+++ b/tools/perf/Documentation/perf-trace.txt
@@ -8,8 +8,10 @@ perf-trace - strace inspired tool
 SYNOPSIS
 --------
 [verse]
-'perf trace'
-'perf trace record'
+'perf trace' [<options>] [<command>]
+'perf trace' [<options>] -- <command> [<options>]
+'perf trace record' [<options>] [<command>]
+'perf trace record' [<options>] -- <command> [<options>]
 
 DESCRIPTION
 -----------
-- 
2.7.4

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