Update 'radio' docs for v1 (#937)

docs/reference/radio/on-received-number.md

@@ -0,0 +1,65 @@
+# on Received Number
+
+Run part of a program when the @boardname@ receives a
+[number](/types/number) over ``radio``.
+
+```sig
+radio.onReceivedNumber(function (receivedNumber) {})
+```
+
+## Parameters
+
+* **receivedNumber**: The [number](/types/number) that was sent in this packet or `0` if this packet did not contain a number. See [send number](/reference/radio/send-number) and [send value](/reference/radio/send-value)
+
+## Examples
+
+### Tell me how fast
+
+This program keeps sending numbers that say how fast the @boardname@ is
+slowing down or speeding up.  It also receives numbers for the same
+thing from nearby @boardname@s. It shows these numbers as a
+[bar graph](/reference/led/plot-bar-graph).
+
+```blocks
+basic.forever(() => {
+    radio.sendNumber(input.acceleration(Dimension.X));
+})
+radio.onReceivedNumber(function (receivedNumber) {
+    led.plotBarGraph(receivedNumber, 1023);
+})
+```
+
+### What's the distance?
+
+This program uses the signal strength from received packets to graph the
+approximate distance between two @boardname@s.
+
+```blocks
+basic.forever(() => {
+    radio.sendNumber(0)
+})
+radio.onReceivedNumber(function (receivedNumber) {
+    led.plotBarGraph(
+        Math.abs(radio.getReceivedPacketProperty(radio.PacketProperty.SignalStrength) + 42),
+        128 - 42
+    )
+})
+```
+
+## Troubleshooting
+
+The ``||radio:onReceivedNumber||`` event can only be created once, due to the hardware restrictions.
+
+The radio set group might need to be set, synchronized , before the radio events will function.
+
+## See also
+
+[on received strig](/reference/radio/on-received-string),
+[send number](/reference/radio/send-number),
+[send string](/reference/radio/send-string),
+[send value](/reference/radio/send-value),
+[set group](/reference/radio/set-group)
+
+```package
+radio
+```