doc/dev/perf: fix dittography

Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>

diff --git a/doc/dev/perf.rst b/doc/dev/perf.rst
index 6fc7d7ed476bf1edaa43c49640eb02dcb5bf6c85..5e42255a6e2823c130d3ad34efa5ab63af5611ef 100644 (file)
--- a/doc/dev/perf.rst
+++ b/doc/dev/perf.rst
@@ -13,11 +13,11 @@ To view by caller (where you can see what each top function calls)::
 
   sudo perf report --call-graph caller
 
-To view by callee (where you can see who calls each each top function)::  
+To view by callee (where you can see who calls each top function)::  
 
   sudo perf report --call-graph callee
 
-:note: If the the caller/callee views look the same you may be
+:note: If the caller/callee views look the same you may be
        suffering from a kernel bug; upgrade to 4.8 or later.
 
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