Extension docs server: fix the rendering of webstore.html.

chrome/common/extensions/docs/server2/templates/private/callback.html

Index: chrome/common/extensions/docs/server2/templates/private/callback.html
diff --git a/chrome/common/extensions/docs/server2/templates/private/callback.html b/chrome/common/extensions/docs/server2/templates/private/callback.html
index 05b2afe60bdd74c3e3d62a2a2cde2bb0546fff7d..71d1adc9d60f487c95e60618c1c58ea10eda62ac 100644
--- a/chrome/common/extensions/docs/server2/templates/private/callback.html
+++ b/chrome/common/extensions/docs/server2/templates/private/callback.html
@@ -1,10 +1,10 @@
 <h4>Callback function</h4>
 <p>
   {{?optional}}
-      If you specify the <em>callback</em> parameter, it should
+      If you specify the <em>{{name}}</em> parameter, it should
       specify a function that looks like this:
   {{:}}
-      The <em>callback</em> parameter should specify a function
+      The <em>{{name}}</em> parameter should specify a function
       that looks like this:
   {{/}}
 </p>