docs: consistency in callback and mId (#1171)

* docs: callback naming consistency

* docs: change mid to mId, camel case consistency

README.md

@@ -491,7 +491,7 @@ Unsubscribe from a topic or topics
 
 -------------------------------------------------------
 <a name="end"></a>
-### mqtt.Client#end([force], [options], [cb])
+### mqtt.Client#end([force], [options], [callback])
 
 Close the client, accepts the following options:
 
@@ -505,19 +505,19 @@ Close the client, accepts the following options:
     * `reasonString`: representing the reason for the disconnect `string`,
     * `userProperties`: The User Property is allowed to appear multiple times to represent multiple name, value pairs `object`,
     * `serverReference`: String which can be used by the Client to identify another Server to use `string`
-* `cb`: will be called when the client is closed. This parameter is
+* `callback`: will be called when the client is closed. This parameter is
   optional.
 
 -------------------------------------------------------
 <a name="removeOutgoingMessage"></a>
-### mqtt.Client#removeOutgoingMessage(mid)
+### mqtt.Client#removeOutgoingMessage(mId)
 
 Remove a message from the outgoingStore.
 The outgoing callback will be called with Error('Message removed') if the message is removed.
 
 After this function is called, the messageId is released and becomes reusable.
 
-* `mid`: The messageId of the message in the outgoingStore.
+* `mId`: The messageId of the message in the outgoingStore.
 
 -------------------------------------------------------
 <a name="reconnect"></a>
@@ -715,15 +715,15 @@ import mqtt from 'mqtt';
 export default () => {
   const [connectionStatus, setConnectionStatus] = React.useState(false);
   const [messages, setMessages] = React.useState([]);
-  
+
   useEffect(() => {
     const client = mqtt.connect(SOME_URL);
     client.on('connect', () => setConnectionStatus(true));
     client.on('message', (topic, payload, packet) => {
       setMessages(messages.concat(payload.toString()));
     });
   }, []);
-  
+
   return (
     <>
      {lastMessages.map((message) => (