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Added SyncVar hook video link.

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doc/Guides/Sync/SyncVarHook.md
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# SyncVar Hook
[![SyncVar hook video tutorial](../../images/video_tutorial.png)](https://www.youtube.com/watch?v=T7AoozedYfI&list=PLkx8oFug638oBYF5EOwsSS-gOVBXj1dkP&index=5)
The hook attribute can be used to specify a function to be called when the SyncVar changes value on the client. This ensures that all clients receive the proper variables from other clients.
- The Hook method must have a single parameter of the same type as the SyncVar property. This parameter should have a unique name, e.g. newValue.
- Reference the hook parameter inside the hook to use the new value. Referencing the property value will be the old value, in case you need to compare.