Improve document

app/models/agents/post_agent.rb

@@ -16,7 +16,8 @@ class PostAgent < Agent
       By default, non-GETs will be sent with form encoding (`application/x-www-form-urlencoded`).  Change `content_type` to `json` to send JSON instead.  Change `content_type` to `xml` to send XML, where the name of the root element may be specified using `xml_root`, defaulting to `post`.
 
       If `emit_events` is set to `true`, the server response will be emitted as an Event and can be fed to a WebsiteAgent for parsing (using its `data_from_event` and `type` options). No data processing
-      will be attempted by this Agent, so the Event's "body" value will always be raw text.  In the Event's "headers" value, header names will be downcased for the ease of using.
+      will be attempted by this Agent, so the Event's "body" value will always be raw text.
+      The Event will also have a "headers" hash with all keys downcased, and a "status" integer value.
 
       Other Options: