doc: fix typo in contributing guide

Change-Id: I6d9a8886cccf1c396ea2dbc659c5bf7548179751
Reviewed-on: https://go-review.googlesource.com/15435
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/doc/contribute.html b/doc/contribute.html
index 45ed8f1..7f74adf 100644
--- a/doc/contribute.html
+++ b/doc/contribute.html
@@ -577,7 +577,7 @@
 &lt;&lt;&lt;&lt;&lt;&lt;&lt; HEAD
 	if arg &lt; 1e9 {
 =======
-	if arg &lh; 1e10 {
+	if arg &lt; 1e10 {
 &gt;&gt;&gt;&gt;&gt;&gt;&gt; mcgillicutty
 		largeReduce(arg)
 </pre>