[patch] perf_event_open.2 remove innaccurate paragaph describing attr.config

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Remove an inaccurate paragraph about values in the attr.config 
field.  This information was never true in any released kernel; 
it somehow snuck into the manpage because it is still described
this way in tools/perf/design.txt in the kernel source tree.

Signed-off-by: Vince Weaver <vincent.weaver@xxxxxxxxx>

diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
index cccb880..003a8b2 100644
--- a/man2/perf_event_open.2
+++ b/man2/perf_event_open.2
@@ -352,12 +352,6 @@ fields are also taken into account in cases where 64 bits is not
 enough to fully specify the event.
 The encoding of these fields are event dependent.
 
-The most significant bit (bit 63) of
-.I config
-signifies CPU-specific (raw) counter configuration data;
-if the most significant bit is unset, the next 7 bits are an event
-type and the rest of the bits are the event identifier.
-
 There are various ways to set the
 .I config
 field that are dependent on the value of the previously
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