doc/go_mem.html: update location of "once".
Fixes #1118.
R=rsc
CC=golang-dev
https://golang.org/cl/2225044
diff --git a/doc/go_mem.html b/doc/go_mem.html
index 33bce5f..7823890 100644
--- a/doc/go_mem.html
+++ b/doc/go_mem.html
@@ -276,8 +276,9 @@
<h3>Once</h3>
<p>
-The <code>once</code> package provides a safe mechanism for
-initialization in the presence of multiple goroutines.
+The <code>sync</code> package provides a safe mechanism for
+initialization in the presence of multiple goroutines
+through the use of the <code>Once</code> type.
Multiple threads can execute <code>once.Do(f)</code> for a particular <code>f</code>,
but only one will run <code>f()</code>, and the other calls block
until <code>f()</code> has returned.
@@ -293,6 +294,7 @@
<pre>
var a string
+var once sync.Once
func setup() {
a = "hello, world"
