doc/go1.13.html: describe error-value additions
A brief description at the top the Standard Library section of the changes to support error wrapping. Fixes #33365. Change-Id: Id5a3b2fe148d9bfb949f2cfc9e5d8a1613a0e219 Reviewed-on: https://go-review.googlesource.com/c/go/+/188798Reviewed-by: Ian Lance Taylor <iant@golang.org>
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