[Ada] Use "[warning enabled by default]" for default warnings

[Richard Sandiford <rdsandiford at googlemail dot com>]

This switches Ada from using [enabled by default] to [warning enabled
by default] for consistency with:

  http://gcc.gnu.org/ml/gcc-patches/2014-02/msg00549.html

Tested on x86_64-linux-gnu.  OK if the above patch goes in?

Thanks,
Richard


gcc/ada/
	* erroutc.adb (Output_Msg_Text): Use "[warning enabled by default]".
	* err_vars.ads, errout.ads, gnat_ugn.texi: Update comments and
	documentation accordingly.

Index: gcc/ada/erroutc.adb
===================================================================
--- gcc/ada/erroutc.adb	2014-02-09 20:02:00.971968883 +0000
+++ gcc/ada/erroutc.adb	2014-02-09 20:02:58.640471235 +0000
@@ -456,7 +456,7 @@ package body Erroutc is
 
       if Warn and then Warn_Chr /= ' ' then
          if Warn_Chr = '?' then
-            Warn_Tag := new String'(" [enabled by default]");
+            Warn_Tag := new String'(" [warning enabled by default]");
 
          elsif Warn_Chr in 'a' .. 'z' then
             Warn_Tag := new String'(" [-gnatw" & Warn_Chr & ']');
Index: gcc/ada/err_vars.ads
===================================================================
--- gcc/ada/err_vars.ads	2014-02-09 20:02:00.971968883 +0000
+++ gcc/ada/err_vars.ads	2014-02-09 20:02:58.639471226 +0000
@@ -141,8 +141,8 @@ package Err_Vars is
    --  Setting is irrelevant if no < insertion character is present. Note
    --  that it is not necessary to reset this after using it, since the proper
    --  procedure is always to set it before issuing such a message. Note that
-   --  the warning documentation tag is always [enabled by default] in the
-   --  case where this flag is True.
+   --  the warning documentation tag is always [warning enabled by default]
+   --  in the case where this flag is True.
 
    Error_Msg_String : String (1 .. 4096);
    Error_Msg_Strlen : Natural;
Index: gcc/ada/errout.ads
===================================================================
--- gcc/ada/errout.ads	2014-02-09 20:02:00.971968883 +0000
+++ gcc/ada/errout.ads	2014-02-09 20:02:58.639471226 +0000
@@ -287,8 +287,8 @@ package Errout is
 
    --    Insertion character ?? (Two question marks: default warning)
    --      Like ?, but if the flag Warn_Doc_Switch is True, adds the string
-   --      "[enabled by default]" at the end of the warning message. For
-   --      continuations, use this in each continuation message.
+   --      "[warning enabled by default]" at the end of the warning message.
+   --      For continuations, use this in each continuation message.
 
    --    Insertion character ?x? (warning with switch)
    --      Like ?, but if the flag Warn_Doc_Switch is True, adds the string
Index: gcc/ada/gnat_ugn.texi
===================================================================
--- gcc/ada/gnat_ugn.texi	2014-02-09 20:02:00.971968883 +0000
+++ gcc/ada/gnat_ugn.texi	2014-02-09 20:02:58.644471270 +0000
@@ -5055,8 +5055,8 @@ indexed components, slices, and selected
 @cindex @option{-gnatw.d} (@command{gcc})
 If this switch is set, then warning messages are tagged, either with
 the string ``@option{-gnatw?}'' showing which switch controls the warning,
-or with ``[enabled by default]'' if the warning is not under control of a
-specific @option{-gnatw?} switch. This mode is off by default, and is not
+or with ``[warning enabled by default]'' if the warning is not under control
+of a specific @option{-gnatw?} switch. This mode is off by default, and is not
 affected by the use of @code{-gnatwa}.
 
 @item -gnatw.D