Add some info regarding DisableSplitPin

[redsigma]

I've noticed that in the case of a custom K2Node which has a Struct as the input parameter and this struct has a delegate with more params, then if you split the struct and drag the delegate pin to auto create an event for it, it wont fill set the correct parameters.
To fix this you have to actually use Make Struct for X and connect this struct into that pin. And use the expand delegate pin from this Make Struct node which properly creates the correct event.

So using DisableSplitPin is beneficial because it avoids confusion. So maybe add a mention that this is useful sometimes when using delegates in structs and these structs are used as input pins.