Fix doxygen typos

Change-Id: Ia54918091e985e21641610ca7652aead7c0dd20a
Signed-off-by: Viet-Hoa Do <viet-hoa.do@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/7621
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Pablo Marquez Tello <pablo.tello@arm.com>
diff --git a/docs/contributor_guide/contribution_guidelines.dox b/docs/contributor_guide/contribution_guidelines.dox
index 02d8495..f26a709 100644
--- a/docs/contributor_guide/contribution_guidelines.dox
+++ b/docs/contributor_guide/contribution_guidelines.dox
@@ -272,7 +272,7 @@
 
         - No '*' in front of argument names
         - [in], [out] or [in,out] *in front* of arguments
-        - Skip a line between the description and params and between params and @return (If there is a return)
+        - Skip a line between the description and params and between params and \@return (If there is a return)
         - Align params names and params descriptions (Using spaces), and with a single space between the widest column and the next one.
         - Use an upper case at the beginning of the description