docs(controls): Fix example story of Controls + MDX section 
docs(controls): Fix example story of Controls + MDX section 

It looks like the extra `;` after a `Story` tag makes `@mdx-js/loader` unhappy, it throws `SyntaxError: Unexpected token (3:8)`. 
Removing that fixes the issue. I also removed the one after `Meta` as it is not needed.
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