user doc: Update description of Retrieve action's Count parameter.
@@ -49,8 +49,15 @@ such tweets, and returns those tweets to the integration.
+
* *Mention* does not require any configuration.
* *Retrieve*
-** *Count* is the maximum number of direct messages to retrieve.
-Direct messages from only the previous 30 days can be returned.
+** *Count* has a default of 100 and you should not need to change
+this value, which affects internal behavior. However, this value
+should never be less than 50.
++
+The *Retrieve* action always returns all previously unreturned
+direct messages received in the last 30 days. If you do not select
+*Ignore direct messages previously found*, then the *Retrieve* action
+returns all messages that have been received in the last 30 days.
+
** *Delay* is the period of time between polls. Twitter enforces
rate limits, so you should not poll too often. The default
interval is 5 seconds.
