docs: Updated NetworkedVar documentation (#316)

Updated NetworkedVar documentation to emphasis the default ownership.

I would probably also write why it is the default and if the write permission can be changed after initalization, I lack knowledge to do that however.

I am new to this project so I am aware I might be not using the correct terminology.
Criticism welcome.

Author: DamodarSojka

docs/_docs/the-basics/networkedvar.md

@@ -21,6 +21,11 @@ Since the NetworkedVar container is a wrapper container around the value, the va
 
 To create your own NetworkedVar container, simply create a class with the INetworkedVar interface and declare it as a field of a NetworkedBehaviour. To learn how to write your own containers for more complex structures, see the NetworkedVar implementation. To learn how to do custom delta encoding on complex structures. See the SyncedDictionary and SyncedLIst implementations.
 
+### Permissions
+By default NetworkedVar and it's subclasses can only be wrote to by the server (NetworkedVarPermission.ServerOnly). To change that set the permission to the desired value during initialization:
+```csharp
+private NetworkedVar<float> myFloat = new NetworkedVar(new NetworkedVarSettings {WritePermission = NetworkedVarPermission.OwnerOnly}, 5);
+```
 
 ### Example
 ```csharp