OO.ui.mixin.IndicatorElement: Fix docs for available indicators
OO.ui.mixin.IndicatorElement: Fix docs for available indicators

Remove 'search', since this isn't an available indicator.

Change-Id: I48ae1187b14bf38a8f5ccc37155ef2be22af2631

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui