.wikiheaders-options: Removed wikipreamble setting.

Reference https://github.com/libsdl-org/sdlwiki/issues/713.

.wikiheaders-options

@@ -14,7 +14,7 @@ projecturl = https://libsdl.org/
 wikiurl = https://wiki.libsdl.org
 bugreporturl = https://github.com/libsdl-org/sdlwiki/issues/new
 warn_about_missing = 0
-wikipreamble = (This is the documentation for SDL3, which is the current stable version. [SDL2](https://wiki.libsdl.org/SDL2/) was the previous version!)
+#wikipreamble = (This is the documentation for SDL3, which is the current stable version. [SDL2](https://wiki.libsdl.org/SDL2/) was the previous version!)
 wikiheaderfiletext = Defined in [<SDL3/%fname%>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/%fname%)
 
 manpageheaderfiletext = Defined in SDL3/%fname%