perf_counter tools: Tidy up manpage details

Also fix a misalignment in usage string printing.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/Documentation/perf_counter/Documentation/perf-top.txt b/Documentation/perf_counter/Documentation/perf-top.txt
index c8eb7cf..539d012 100644
--- a/Documentation/perf_counter/Documentation/perf-top.txt
+++ b/Documentation/perf_counter/Documentation/perf-top.txt
@@ -1,5 +1,5 @@
 perf-top(1)
-==========
+===========
 
 NAME
 ----