docs: fix 2d picker image description

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<h2 id="2DPicker" style="clear:both">2D Picker</h2>

<p>A 2D Picker component in your app can be invoked from the cue card or from an action button. It allows users to choose from a list of items, and optionally select an attribute of each item. For example, in response to a voice action to “buy tickets to a movie tonight,” you could show a 2D Picker with a vertical list of movies playing, with each movie having a horizontal list of showtimes.</p>

<p>A 2D Picker component in your app can be invoked from the cue card or from an action button. It allows users to choose from a list of items, and optionally select an attribute of each item. For example, for a social check-in app, you could show a 2D Picker with a vertical list of places

to check-in to.</p>

<img src="{@docRoot}design/media/wear/2D_picker_action.png" width="500" alt="">