strings: add example for ContainsRune
Change-Id: I994f003c97a14d194df5f07dd217c0ff3b214741 Reviewed-on: https://go-review.googlesource.com/48874Reviewed-by:Matt Layher <mdlayher@gmail.com> Run-TryBot: Matt Layher <mdlayher@gmail.com>
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