[Ada] Minor comment fix

2018-05-25  Bob Duff  <duff@adacore.com>

gcc/ada/

	* sem_util.ads: Minor comment fix.

From-SVN: r260718

gcc/ada/ChangeLog

+2018-05-25  Bob Duff  <duff@adacore.com>
+
+	* sem_util.ads: Minor comment fix.
+
 2018-05-25  Ed Schonberg  <schonberg@adacore.com>
 
 	* exp_unst.adb (Visit_Node): Restrict check for uplevel references in

gcc/ada/sem_util.ads

@@ -2781,7 +2781,7 @@ package Sem_Util is
    --  specified we check only for the given stream operation.
 
    function Unique_Defining_Entity (N : Node_Id) return Entity_Id;
-   --  Return the entity which represents declaration N, so that different
+   --  Return the entity that represents declaration N, so that different
    --  views of the same entity have the same unique defining entity:
    --    * private view and full view of a deferred constant
    --        --> full view