Updated documentation

darcs-hash:20090321115829-58252-417fc23e51c9f7c0f0428c93f0c168798f66207b
Removed dialog_event.subscribe_enabled account setting

Ignore-this: f0e9d130bdf41cdd56831d61a23bbfef

darcs-hash:20090321193650-1e3d8-2d7afe2e8fecc7b8dd54d65caf92591cc1f5a66d