errors: reference Go 1.13 article about errors

[matttproud]

This commit amends package errors' documentation to include a reference
to the https://go.dev/blog/go1.13-errors blog article. The motivation
is multi-fold, but chiefly the article includes good information about
error philosophy (e.g., when to wrap), and developers who have come to
Go in the intervening five years are likely not have seen this article
at all given the nature of blog publishing and post fanfare. The
material deserves a promotion in visibility.

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This PR is being closed because golang.org/cl/616341 has been merged.