typo

R=iant
CC=golang-dev
https://golang.org/cl/3582042

doc/go_mem.html

@@ -169,7 +169,7 @@ In fact, an aggressive compiler might delete the entire <code>go</code> statemen
 <p>
 If the effects of a goroutine must be observed by another goroutine,
 use a synchronization mechanism such as a lock or channel
-communiation to establish a relative ordering.
+communication to establish a relative ordering.
 </p>
 
 <h3>Channel communication</h3>