doc: fixes to contributor docs

Change-Id: Ib31fb1f8239d8113728bc4c6e411416721571341
Reviewed-on: https://go-review.googlesource.com/1743
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/doc/contribute.html b/doc/contribute.html
index 883196a..a50dd85 100644
--- a/doc/contribute.html
+++ b/doc/contribute.html
@@ -139,7 +139,7 @@
 </p>
 
 <pre>
-$ git review help
+$ git codereview help
 </pre>
 
 <p>
@@ -165,7 +165,7 @@
 </p>
 
 <pre>
-$ git review sync
+$ git codereview sync
 </pre>
 
 <p>
@@ -204,7 +204,7 @@
 <p>After installing the <code>git-codereview</code> command, you can run</p>
 
 <pre>
-$ git review help
+$ git codereview help
 </pre>
 
 <p>