fix(aria/combobox): fix autocomplete examples and add comments explaining combobox selection behavior #32714
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Autocomplete examples were actually incorrectly using ngModel to populate the input value, which was colliding with the ngComboboxInput usage of [value} so clearing the query did not work properly.
Updated all the examples to check and clear the value on the ComboboxInput instead.
Also added clarifying comments in the Combox behavior logic which checks for an active item, then drops it, but then checks again when selecting.