Agree. Though, let's get this pull request in first before adjusting that part.  

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Hoa V. Dinh

> I'm personally not a big fan of putting text into a UI telling the user how to use it. I don't think it matters for this CL. In the future, we may just let the users discover the scrolling zoom on their own, based on past experience with other UIs. And/or put some floating zoom buttons up.  
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