MdeModulePkg:Refine the function comments

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17852 6f19259b-4bc3-4df7-8a09-765794883524
diff --git a/MdeModulePkg/Universal/DisplayEngineDxe/ProcessOptions.c b/MdeModulePkg/Universal/DisplayEngineDxe/ProcessOptions.c
index f55fb2e..c074f4b 100644
--- a/MdeModulePkg/Universal/DisplayEngineDxe/ProcessOptions.c
+++ b/MdeModulePkg/Universal/DisplayEngineDxe/ProcessOptions.c
@@ -21,6 +21,7 @@
   Concatenate a narrow string to another string.

 

   @param Destination The destination string.

+  @param DestMax     The Max length of destination string.

   @param Source      The source string. The string to be concatenated.

                      to the end of Destination.