Updated documentation on `selection` event

[justingolden21]

Is your feature request related to a problem? Please describe.

It was difficult to figure out how to programmatically get the resulting selection when an autocomplete item is selected.

Thoroughly Describe the solution you'd like

Documentation on the selection event. Same code:

events: {
	input: {
		selection(event) {
			const feedback = event.detail;
			const selection = feedback.selection.value[feedback.selection.key];
			console.log(selection);
			console.log(feedback.selection);
		}
	}
}

Please provide a few use cases for this feature

1. I imagine most programmers will want to do something with the data they select, otherwise there would be no reason to use this library other than for mockups

Please Describe alternatives you've considered

I searched through the docs on configuration and was unable to find it:

[dombarnes]

If your autoComplete instance is assigned to a variable called autoCompleteJS then you should be able to access it:
In my case, each item in my data source is an object { key: 'MyKey", value: 'MyValue' }

events: {
      input: {
        selection: (event) => {
          const { selection } = event.detail
          console.log(selection.value) // the entry that was selected, either the string value or the object from your array
          searchField.input.value = selection.value.key // I'm then accessing my key property
        }
    }
}

In your example you're trying to access the an index on selected value as if its an array.