errors: add example for Is
Add ExampleIs to illustrate how errors.Is works. Updates #31716. Updates #38369. Change-Id: I1b9a6667614635aa3a5ed8b2c108d8eb6f35748b Reviewed-on: https://go-review.googlesource.com/c/go/+/228038 Reviewed-by:Damien Neil <dneil@google.com>
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