[PATCH] perf tools: Fix syntax in documentation of intel-pt config option

[Jack Henschel <jackdev@mailbox.org>]

As specified in tools/perf/Documentation/perf-config.txt, perf
configuration items must be in 'key = value' format, otherwise the
following error message occurs:

$ perf record -e intel_pt//u -- ls
bad config file line 2 in ~/.perfconfig
$ cat .perfconfig
[intel-pt]
    mispred-all

Changing assigning a value to the key 'mispred-all' fixes the issue:
$ perf record -e intel_pt//u -- ls
[ perf record: Woken up 1 times to write data ]
[ perf record: Capured and wrote 0.031 MB perf.data]
$ cat .perfconfig
[intel-pt]
    mispred-all = true
---
 tools/perf/Documentation/intel-pt.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/intel-pt.txt b/tools/perf/Documentation/intel-pt.txt
index 4b6cdbf8f935..a47d845b9b61 100644
--- a/tools/perf/Documentation/intel-pt.txt
+++ b/tools/perf/Documentation/intel-pt.txt
@@ -873,7 +873,7 @@ amended to take the number of elements as a parameter.
 
 	$ cat ~/.perfconfig
 	[intel-pt]
-		mispred-all
+		mispred-all = on
 
 	$ perf record -e intel_pt//u ./sort 3000
 	Bubble sorting array of 3000 elements
-- 
2.14.1