[Ada] Minor: remove a ??? comment

Minor: remove the ??? comment for the Inside_A_Generic flag. The current
name is clear and concise, even though we are noun-ing the adjective
"generic".

2019-08-14  Bob Duff  <duff@adacore.com>

gcc/ada/

	* sem.ads (Inside_A_Generic): Remove the ??? comment.

From-SVN: r274460

gcc/ada/ChangeLog

+2019-08-14  Bob Duff  <duff@adacore.com>
+
+	* sem.ads (Inside_A_Generic): Remove the ??? comment.
+
 2019-08-14  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* inline.ads (Pending_Descriptor): Delete.

gcc/ada/sem.ads

@@ -275,7 +275,6 @@ package Sem is
    --  flag is False to disable any code expansion (see package Expander). Only
    --  the generic processing can modify the status of this flag, any other
    --  client should regard it as read-only.
-   --  Probably should be called Inside_A_Generic_Template ???
 
    Inside_Freezing_Actions : Nat := 0;
    --  Flag indicating whether we are within a call to Expand_N_Freeze_Actions.