doc: reword about PubSub in readme

README.md

@@ -211,12 +211,12 @@ err = c.Receive(context.Background(), c.B().Subscribe().Channel("ch1", "ch2").Bu
 })
 ```
 
-The provided message handler will be called once message is received.
+The provided handler will be called with received message.
 
-It is important to note that `Client.Receive()` will block and then return value only when the following cases:
-1. `nil`, when received any unsubscribe/punsubscribe message related to the provided `subscribe` command.
-2. `rueidis.ErrClosing`, when the client is closed manually.
-3. `ctx.Err()`, when the deadline of `ctx` is exceeded.
+It is important to note that `Client.Receive()` will keep blocking and return only when the following cases:
+1. return `nil`, when received any unsubscribe/punsubscribe message related to the provided `subscribe` command.
+2. return `rueidis.ErrClosing`, when the client is closed manually.
+3. return `ctx.Err()`, when the `ctx` is done.
 
 While the `Client.Receive()` call is blocking, the `Client` is still able to accept other concurrent requests,
 and they are sharing the same tcp connection. If your message handler may take some time to complete, it is recommended