docs: Added docs about onPlayer** events

docs/defaultEvents/general/onUnban.md

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+# `event` onUnban
+!!! note
+    If serial/mac/ip/name indexes doesn't exist, then the parameters has not been specified when ban was added.
+    If timestamp doesn't exist, then ban was permanent.
+
+This event is triggered when ban with specified info is being removed.
+
+Original: [onExit](https://gothicmultiplayerteam.gitlab.io/docs/0.3.0/script-reference/server-events/general/onUnban/)
+
+## Parameters
+* `dict` **kwargs**:
+    * `str` **mac**: MAC address of the banned player.
+    * `str` **ip**: IP address of the banned player.
+    * `str` **serial**: serial of the banned player.
+    * `str` **name**: nickname of the banned player.
+    * `int` **timestamp**: timestamp when the ban expires.
+
+## Usage
+```python
+import g2o
+        
+@g2o.event('onUnban')
+def onUnban(**kwargs):
+    print(f'Player {kwargs['name']} has been unbanned.')
+```