docs: Added onPlayerUseCheat and NPC related events

docs/defaultEvents/npc/onNpcDestroyed.md

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+# `event` onNpcDestroyed
+
+This event is triggered when remote NPC is created.
+
+Original: [onNpcDestroyed](https://gothicmultiplayerteam.gitlab.io/docs/0.3.0/script-reference/server-events/npc/onNpcDestroyed/)
+
+## Parameters
+* `dict` **kwargs**:
+    * `int` **npc_id**: the id of the destroyed remote npc.
+
+## Usage
+```python
+import g2o
+        
+@g2o.event('onNpcDestroyed')
+def onNpcDestroy(**kwargs):
+    print(f'NPC {kwargs['npc_id']} has been destroyed.')
+```