os: add example for IsNotExist
Show usage of os.IsNotExist in an example. Change-Id: I5306ea06c370099de5b02668dfa02b87b0c2beac Reviewed-on: https://go-review.googlesource.com/25571Reviewed-by:Russ Cox <rsc@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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