tools doc: fix use of block in an element

Also, adjust @history[] use to make the change more clear in
rendered docs.

pkgs/drracket-pkgs/drracket/scribblings/tools/doc-util.rkt

@@ -16,7 +16,7 @@
   (language-info-def id . args)
   (language-info-def/proc 'id . args))
 
-(define (language-info-def/proc sym . args)
+(define (language-info-def/proc sym arg0 . args)
   (define str (format "~s" sym))
-  (apply elemtag str args))
+  (list (elemtag str arg0) args))
 

pkgs/drracket-pkgs/drracket/scribblings/tools/tools.scrbl

@@ -273,17 +273,17 @@ These precise colors for these identifiers are controlled by the preferences dia
   extending the default that DrRacket normally uses, namely:
   @racketblock[`(["Racket Sources" "*.rkt;*.scrbl;*.rktl;*.rktd;*.ss;*.scm"]
                  ["Any" "*.*"])]
-  @history[#:added "1.1"]
 }
 
 @language-info-def[drracket:default-extension]{
   When a language's @racket[_get-info] procedure responds to @racket['drracket:default-extension],
   it is expected to return @racket[(and/c string? (not/c #rx"[.]"))]; the result is used
   as the default extension when saving files by setting @racket[finder:default-extension].
-  
-  @history[#:added "1.1"]
 }
 
+@history[#:changed "1.1" @elem{Added support for @racket['drracket:default-filters]
+                               and @racket['drracket:default-extension].}]
+
 @subsection{Adding Module-based Languages to DrRacket}
 
 For backwards compatibility, DrRacket also supports