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doc/go_mem.html: update location of "once".
Fixes #1118. R=rsc CC=golang-dev https://golang.org/cl/2225044
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@ -276,8 +276,9 @@ before the <i>n</i>+1'th call to <code>l.Lock</code>.
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<h3>Once</h3>
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<p>
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The <code>once</code> package provides a safe mechanism for
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initialization in the presence of multiple goroutines.
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The <code>sync</code> package provides a safe mechanism for
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initialization in the presence of multiple goroutines
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through the use of the <code>Once</code> type.
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Multiple threads can execute <code>once.Do(f)</code> for a particular <code>f</code>,
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but only one will run <code>f()</code>, and the other calls block
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until <code>f()</code> has returned.
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@ -293,6 +294,7 @@ In this program:
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<pre>
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var a string
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var once sync.Once
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func setup() {
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a = "hello, world"
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