2.1.28, initiation update to PXT v5.28.24 (#54)

docs/reference/radio/send-string.md

@@ -1,18 +1,25 @@
-# Send String
+# send String
 
 Sends a string to other @boardname@s in the area connected by radio. The
 maximum string length is 19 characters.
 
 ```sig
-radio.sendString("Hello!")
+radio.sendString("hi!")
 ```
 
-### Parameters
+## Parameters
 
-* `msg` is a [string](/reference/types/string) to send by radio.
+* **msg**: a [string](/types/string) to send by radio.
 
+## ~ hint
 
-### Example: Two-way radio
+Watch this video to see how the radio hardware works on the @boardname@:
+
+https://www.youtube.com/watch?v=Re3H2ISfQE8
+
+## ~
+
+## Example: Two-way radio
 
 If you load this program onto two or more @boardname@s, you can send a
 code word from one of them to the others by pressing button `A`.  The
@@ -23,21 +30,20 @@ input.onButtonPressed(Button.A, () => {
     radio.sendString("Codeword: TRIMARAN")
     basic.showString("SENT");
 })
-
-radio.onDataPacketReceived(({ receivedString }) => {
+radio.onReceivedString(function (receivedString) {
     basic.showString(receivedString);
-});
+})
 ```
 
-### ~hint
+## ~hint
 
 A radio that can both transmit and receive is called a _transceiver_.
 
-### ~
+## ~
 
-### See also
+## See also
 
-[on data packet received](/reference/radio/on-data-packet-received)
+[on received string](/reference/radio/on-received-string)
 
 ```package
 radio