Insert new hw video links (#1910)

docs/reference/input/on-pin-pressed.md

@@ -29,6 +29,12 @@ instead of the USB cable.
 
 * ``name`` means the pin that is being pressed, either `P0`, `P1`, or `P2`
 
+## Pin presses in action
+
+See how the @boardname@ detects a press at a pin or on something connected to a pin in this video:
+
+https://www.youtube.com/watch?v=GEpZrvbsO7o
+
 ## Example: pin pressed counter
 
 This program counts how many times you press the `P0` pin. 
@@ -36,10 +42,10 @@ Every time you press the pin, the program shows the number of times on the scree
 
 ```blocks
 let count = 0
-basic.showNumber(count, 100)
+basic.showNumber(count)
 input.onPinPressed(TouchPin.P0, () => {
     count = count + 1
-    basic.showNumber(count, 100)
+    basic.showNumber(count)
 })
 ```
 

docs/reference/input/pin-is-pressed.md

@@ -25,6 +25,12 @@ instead of the USB cable.
 
 * a [boolean](/blocks/logic/boolean) that means whether the pin you say is pressed (`true` or `false`)
 
+## Pin presses in action
+
+See how the @boardname@ detects a press at a pin or on something connected to a pin in this video:
+
+https://www.youtube.com/watch?v=GEpZrvbsO7o
+
 ## Example
 
 This program shows `1` if `P0` is pressed, and `0` if `P0` is not pressed:

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

@@ -11,6 +11,14 @@ radio.onReceivedNumber(function (receivedNumber) {})
 
 * **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)
 
+## ~ hint
+
+Watch this video to see how the radio hardware works on the @boardname@:
+
+https://www.youtube.com/watch?v=Re3H2ISfQE8
+
+## ~
+
 ## Examples
 
 ### Tell me how fast

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

@@ -10,6 +10,14 @@ radio.onReceivedString(function (receivedString) {})
 
 * **receivedString**: The [string](/types/string) that was sent in this packet or the empty string if this packet did not contain a string. See [send string](/reference/radio/send-string) and [send value](/reference/radio/send-value)
 
+## ~ hint
+
+Watch this video to see how the radio hardware works on the @boardname@:
+
+https://www.youtube.com/watch?v=Re3H2ISfQE8
+
+## ~
+
 ## Example
 
 This program continuously sends a cheerful message. It also receives a messages from nearby @boardname@s. It shows these messages on the screen.

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

@@ -11,6 +11,14 @@ radio.onReceivedValue(function (name, value) {})
 * **name**: a [string](/types/string) that is a name for the value received.
 * **value**: a [number](/types/number) that is the value received.
 
+## ~ hint
+
+Watch this video to see how the radio hardware works on the @boardname@:
+
+https://www.youtube.com/watch?v=Re3H2ISfQE8
+
+## ~
+
 ## Example
 
 This program keeps sending numbers that say how fast the @boardname@ is

docs/reference/radio/send-number.md

@@ -10,6 +10,13 @@ radio.sendNumber(0);
 
 * **value**: a [number](/types/number) to send.
 
+## ~ hint
+
+Watch this video to see how the radio hardware works on the @boardname@:
+
+https://www.youtube.com/watch?v=Re3H2ISfQE8
+
+## ~
 
 ## Examples
 

docs/reference/radio/send-string.md

@@ -11,6 +11,13 @@ radio.sendString("Hello!")
 
 * **msg**: a [string](/types/string) to send by radio.
 
+## ~ hint
+
+Watch this video to see how the radio hardware works on the @boardname@:
+
+https://www.youtube.com/watch?v=Re3H2ISfQE8
+
+## ~
 
 ## Example: Two-way radio
 

docs/reference/radio/send-value.md

@@ -12,6 +12,14 @@ radio.sendValue("name", 0);
 * **name**: a [string](/types/string) that is the name of the value to send.
 * **value**: a [number](/types/number) that is the value to send.
 
+## ~ hint
+
+Watch this video to see how the radio hardware works on the @boardname@:
+
+https://www.youtube.com/watch?v=Re3H2ISfQE8
+
+## ~
+
 ## Example: Broadcasting acceleration
 
 This program sends your @boardname@'s **acceleration** (amount it is