Document process for clearing routings using the ExecuteSwitch method from IRouting

[jtalborough]

[andrew-welker]

In most cases, this will be done by setting the inputSelector parameter as null.

[TrevorPayne]

If I recall correctly, since we utilize 'CrestronCollection' for inputs and outputs, attempting to set a '0' should work as well. It attempts to get a [0] index which doesn't exist and returns null, thus setting the object to the desired value.