docs: Added docs about onPlayer** events

docs/defaultEvents/player/onPlayerChangeWorld.md

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+# `event` onPlayerChangeWorld
+This event is triggered when player tries to change his currently played world (ZEN).
+
+Original: [onPlayerChangeWorld](https://gothicmultiplayerteam.gitlab.io/docs/0.3.0/script-reference/server-events/player/onPlayerChangeWorld/)
+
+## Parameters
+* `dict` **kwargs**:
+    * `int` **playerid**: the id of the player who tries to change the played world.
+    * `str` **world**: a filename name of the world.
+    * `str` **waypoint**:  a name of the waypoint that the player will be teleported to.
+    
+## Usage
+```python
+import g2o
+        
+@g2o.event('onPlayerChangeWorld')
+def onChangeWorld(**kwargs):
+    print(f'Player {kwargs['playerid']} teleported to {kwargs['world']} at {kwargs['waypoint']}')
+```