Move DocData and Collada out of their subfolders

Now that the unused DocDump was removed, the `editor/doc` subfolder is
redundant.

Similarly, there's no reason for Collada to have a subfolder for itself
when glTF or OBJ don't.

modules/gdscript/language_server/lsp.hpp

@@ -33,7 +33,7 @@
 
 #include "core/class_db.h"
 #include "core/list.h"
-#include "editor/doc/doc_data.h"
+#include "editor/doc_data.h"
 
 namespace lsp {