docs: Godot RPC's don't need to send argument names

[elementbound]

Hey, I wanted to highlight a minor issue with the docs on Server-Client synchronization

You may also note that argument names for these functions are a single letter. This is intentional due to Godot needing to send argument names when performing RPCs.

As I've recently found out in https://github.com/foxssake/netfox/issues/290, this is not true - Godot only sends the list of arg values, the names are not transmitted.