doc: remove repeated words in contribution guide

Signed-off-by: Yong Wang <wang.yong19@zte.com.cn>
Acked-by: John McNamara <john.mcnamara@intel.com>

diff --git a/doc/guides/contributing/documentation.rst b/doc/guides/contributing/documentation.rst
index 2cfb1a2..5ec0675 100644 (file)
--- a/doc/guides/contributing/documentation.rst
+++ b/doc/guides/contributing/documentation.rst
@@ -332,7 +332,7 @@ Whitespace
 Section Headers
 ~~~~~~~~~~~~~~~
 
-* Section headers should use the use the following underline formats::
+* Section headers should use the following underline formats::
 
    Level 1 Heading
    ===============