doc/go1.2.html: update a minor change to syscall

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/14379043

doc/go1.2.html

@@ -880,7 +880,8 @@ which swaps an <code>unsafe.Pointer</code>.
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-syscall: implemented Sendfile for Darwin, added Syscall9 for Darwin/amd64 (CL 10980043).
+The <a href="/pkg/syscall/"><code>syscall</code></a> package now implements
+<a href="/pkg/syscall/#Sendfile"><code>Sendfile</code></a> for Darwin.
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