getargs: don't label --language/-l as experimental

* NEWS: Announce it.
* doc/bison.texi, src/getargs.c (usage): Here.

NEWS

@@ -2,6 +2,11 @@ GNU Bison NEWS
 
 * Noteworthy changes in release ?.? (????-??-??) [?]
 
+** %language is no longer an experimental feature.
+
+  The introduction of this feature, in 2.4, was four years ago. The --language
+  option and the %language directive are no longer experimental.
+
 ** New value for %define variable: api.pure full
 
   The %define variable api.pure requests a pure (reentrant) parser. However,

doc/bison.texi

@@ -5170,8 +5170,6 @@ Specify the programming language for the generated parser.  Currently
 supported languages include C, C++, and Java.
 @var{language} is case-insensitive.
 
-This directive is experimental and its effect may be modified in future
-releases.
 @end deffn
 
 @deffn {Directive} %locations
@@ -9289,9 +9287,6 @@ Specify the programming language for the generated parser, as if
 Summary}).  Currently supported languages include C, C++, and Java.
 @var{language} is case-insensitive.
 
-This option is experimental and its effect may be modified in future
-releases.
-
 @item --locations
 Pretend that @code{%locations} was specified.  @xref{Decl Summary}.
 

src/getargs.c

@@ -307,7 +307,6 @@ Operation modes:\n\
       fputs (_("\
 Parser:\n\
   -L, --language=LANGUAGE          specify the output programming language\n\
-                                   (this is an experimental feature)\n\
   -S, --skeleton=FILE              specify the skeleton to use\n\
   -t, --debug                      instrument the parser for debugging\n\
       --locations                  enable location support\n\