[PATCH 2/2] perf docs: Fix perf-check manual page built with asciidoctor

[Ben Hutchings]

asciidoctor is more picky than asciidoc about the length of heading
underlines, and currently mis-parses perf-check.txt:

  ASCIIDOC perf-check.1
asciidoctor: ERROR: perf-check.txt: line 1: non-conforming manpage title
asciidoctor: ERROR: perf-check.txt: line 1: name section expected
asciidoctor: WARNING: perf-check.txt: line 2: unterminated example block
asciidoctor: WARNING: perf-check.txt: line 5: unterminated listing block

Fix the length of the title underline so it works properly.

Fixes: 98ad0b77323c ("perf check: Introduce 'check' subcommand")
Signed-off-by: Ben Hutchings <benh@xxxxxxxxxx>
---
 tools/perf/Documentation/perf-check.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-check.txt b/tools/perf/Documentation/perf-check.txt
index a764a4629220..80eb1de4eee0 100644
--- a/tools/perf/Documentation/perf-check.txt
+++ b/tools/perf/Documentation/perf-check.txt
@@ -1,5 +1,5 @@
 perf-check(1)
-===============
+=============
 
 NAME
 ----

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