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doc: add reference to FAQ to explain warning about concrete type
R=golang-dev, adg CC=golang-dev https://golang.org/cl/5820048
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@ -258,8 +258,9 @@ Next we modify the appHandler type to return <code>*appError</code> values:
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<p>
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(It's usually a mistake to pass back the concrete type of an error rather than
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<code>error</code>, for reasons to be discussed in another article, but
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it's the right thing to do here because <code>ServeHTTP</code> is the only
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<code>error</code>,
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for reasons discussed in <a href="/doc/go_faq.html#nil_error">the Go FAQ</a>,
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but it's the right thing to do here because <code>ServeHTTP</code> is the only
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place that sees the value and uses its contents.)
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</p>
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