Document allowDuplicates config option

Author: benvinegar

docs/config.rst

@@ -264,6 +264,12 @@ Those configuration options are documented below:
     onError
         Callback to be invoked upon a failed request.
 
+.. describe:: allowDuplicates
+
+    By default, Raven.js attempts to suppress duplicate captured errors and messages that occur back-to-back. Such events are often triggered by rogue code (e.g. from a `setInterval` callback in a browser extension), are not actionable, and eat up your event quota.
+
+    To disable this behavior (for example, when testing), set ``allowDuplicates: true`` during configuration.
+
 .. describe:: allowSecretKey
 
     By default, Raven.js will throw an error if configured with a Sentry DSN that contains a secret key.