DocData: Skip unexposed classes

Properly expose classes that we actually want accessible.

(cherry picked from commit 0ef8bcac4d)

modules/bullet/config.py

@@ -3,12 +3,3 @@ def can_build(env, platform):
 
 def configure(env):
     pass
-
-def get_doc_classes():
-    return [
-        "BulletPhysicsDirectBodyState",
-        "BulletPhysicsServer",
-    ]
-
-def get_doc_path():
-    return "doc_classes"