BGE: fixed nomenclature of KX_Scene::addObject and KX_Scene::AddReplicaObject

KX_Scene::addObject: Changed the parameter "other" to "reference", as "other" doesn't mean anything.
KX_Scene::AddReplicaObject: Changed the parameter "parentobject" to "referenceobject", as the parameter did NOT contain a parent object in any way.

Now both functions use the same kind of name for the same thing.

Thanks to panzergame / Porteries Tristan.

doc/python_api/rst/bge_types/bge.types.KX_Scene.rst

@@ -131,14 +131,14 @@ base class --- :class:`PyObjectPlus`
 
       :type: Vector((gx, gy, gz))
 
-   .. method:: addObject(object, other, time=0)
+   .. method:: addObject(object, reference, time=0)
 
       Adds an object to the scene like the Add Object Actuator would.
 
-      :arg object: The object to add
+      :arg object: The (name of the) object to add.
       :type object: :class:`KX_GameObject` or string
-      :arg other: The object's center to use when adding the object
-      :type other: :class:`KX_GameObject` or string
+      :arg reference: The (name of the) object which position, orientation, and scale to copy.
+      :type reference: :class:`KX_GameObject` or string
       :arg time: The lifetime of the added object, in frames. A time of 0 means the object will last forever.
       :type time: integer
       :return: The newly added object.