fix typo in README.md

README.md

@@ -184,7 +184,7 @@ Review the mqtt.Options, mqtt.Capabilities, and mqtt.Compatibilities structs for
 
 Some choices were made when deciding the default configuration that need to be mentioned here:
 
-- By default, the value of `server.Options.Capabilities.MaximumMessageExpiryInterval` is set to 86400 (24 hours), in order to prevent exposing the broker to DOS attacks on hostile networks when using the out-of-the-box configuration (as an infinite expiry would allow an infinite number of retained/inflight messages to accumulate). If you are operating in a trusted environment, or you have capacity for a larger retention period, uou may wish to override this (set to `math.MaxInt64` for no expiry).
+- By default, the value of `server.Options.Capabilities.MaximumMessageExpiryInterval` is set to 86400 (24 hours), in order to prevent exposing the broker to DOS attacks on hostile networks when using the out-of-the-box configuration (as an infinite expiry would allow an infinite number of retained/inflight messages to accumulate). If you are operating in a trusted environment, or you have capacity for a larger retention period, you may wish to override this (set to `math.MaxInt64` for no expiry).
 
 ## Event Hooks 
 A universal event hooks system allows developers to hook into various parts of the server and client life cycle to add and modify functionality of the broker. These universal hooks are used to provide everything from authentication, persistent storage, to debugging tools.