wikiheaders-options: Clean up header file info a bit more.

.wikiheaders-options

@@ -15,5 +15,5 @@ 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 under heavy development and the API is changing! [SDL2](https://wiki.libsdl.org/SDL2/) is the current stable version!)
-wikiheaderfiletext = Defined in [%fname%](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/%fname%)
-manpageheaderfiletext = Defined in %fname%
+wikiheaderfiletext = Defined in [<SDL3/%fname%>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/%fname%)
+manpageheaderfiletext = Defined in SDL3/%fname%