Added missing message fields

docs/en/manuals/physics-messages.md

@@ -20,6 +20,9 @@ The `"collision_response"` message is sent for all collision objects. It has the
 `other_group`
 : the collision group of the other collision object (`hash`)
 
+`own_group`
+: the collision group of the collision object (`hash`)
+
 The collision_response message is only adequate to resolve collisions where you don't need any details on the actual intersection of the objects, for example if you want to detect if a bullet hits an enemy. There is only one of these messages sent for any colliding pair of objects each frame.
 
 ```Lua
@@ -66,9 +69,12 @@ The `"contact_point_response"` message is sent when one of the colliding objects
 `other_position`
 : the world position of the other collision object (`vector3`).
 
-`group`
+`other_group`
 : the collision group of the other collision object (`hash`).
 
+`own_group`
+: the collision group of the collision object (`hash`).
+
 For a game or application where you need to separate objects perfectly, the `"contact_point_response"` message gives you all information you need. However, note that for any given collision pair, several `"contact_point_response"` messages can be received each frame, depending on the nature of the collision. See [Resolving collisions for more information](/manuals/physics-resolving-collisions).
 
 ```Lua
@@ -96,6 +102,12 @@ In a trigger collision `"collision_response"` messages are sent. In addition, tr
 `enter`
 : `true` if the interaction was an entry into the trigger, `false` if it was an exit. (`boolean`).
 
+`other_group`
+: the collision group of the other collision object (`hash`).
+
+`own_group`
+: the collision group of the collision object (`hash`).
+
 ```Lua
 function on_message(self, message_id, message, sender)
     -- check for the message