Fix ServiceTypes, ExcludeServiceTypes, and DocPath desktop file entries to match XDG specifications

bibletime.desktop

@@ -23,4 +23,4 @@ Type=Application
 X-TDE-SubstituteUID=false
 X-TDE-Username=
 Categories=X-Bible;X-Religion;Literature;Art;Education;Utility;TDE;QT
-DocPath=bibletime/handbook/index.html
+X-DocPath=bibletime/handbook/index.html