Explain 'ui.show-headers' variable.

Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Jiri Olsa <jo...@redhat.com>
Signed-off-by: Taeung Song <treeze.tae...@gmail.com>
---
 tools/perf/Documentation/perf-config.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/perf/Documentation/perf-config.txt 
b/tools/perf/Documentation/perf-config.txt
index b04c2bc..129efb1 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -280,6 +280,11 @@ hist.*::
               and 'baz' to 50.00% for each, while 'absolute' would show their
               current overhead (33.33%).
 
+ui.*::
+       ui.show-headers::
+               There're columns as header 'Overhead', 'Children', 'Shared 
Object', 'Symbol', 'self'.
+               If this option is false, they are hiden. This option is only 
applied to TUI.
+
 SEE ALSO
 --------
 linkperf:perf[1]
-- 
1.9.1

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