sem.adb: Minor rewording (comment)

2008-08-06  Thomas Quinot  <quinot@adacore.com>

	* sem.adb: Minor rewording (comment)

From-SVN: r138774

gcc/ada/sem.adb

@@ -1341,7 +1341,7 @@ package body Sem is
       --  Compile predefined units with GNAT_Mode set to True, to properly
       --  process the categorization stuff. However, do not set set GNAT_Mode
       --  to True for the renamings units (Text_IO, IO_Exceptions, Direct_IO,
-      --  Sequential_IO) as this would prevent pragma System_Extend to be
+      --  Sequential_IO) as this would prevent pragma Extend_System from being
       --  taken into account, for example when Text_IO is renaming DEC.Text_IO.
 
       --  Cleaner might be to do the kludge at the point of excluding the