Update index.html

Author: doapp-ryanp

index.html

@@ -380,7 +380,7 @@ <h1 id="configurations">Configurations</h1>
               <span class="info">optional</span>
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-              Optional opaque value used by the client to maintain state between the request and callback.
+              An arbitrary unique string created by your app to guard against <a href="http://en.wikipedia.org/wiki/Cross-site_request_forgery" target="_blank">Cross-site Request Forgery</a>.
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