Patch in pages for built-in extension "Learn More" links (#1352)

* patch in pages for "Learn More" links

* put package spec at the end

* extra newline

libs/radio-broadcast/docs/reference/radio-broadcast.md

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+# Radio Broadcast
+
+The Radio Broadcast extension has blocks for sending to and receiving messages from all the @boardname@ boards nearby. Just two blocks are used, one to send a broadcast message and another to run code when a broadcast message is received.
+
+A message, which is a [number](/types/number), is sent to, or received by all nearby @boardname@ boards regardless of which [Group](/reference/radio/set-group) number they are transmitting or receiving on.
+
+## Blocks in this extension
+
+```cards
+radio.sendMessage(0)
+radio.onReceivedMessage(0, function() {})
+```
+
+## See Also
+
+[send message](/reference/radio/send-message),
+[send value](/reference/radio/on-received-message)
+
+```package
+radio-broadcast
+```

libs/servo/docs/reference/servo.md

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+# Servo
+
+This extension has blocks to rotate and run servos connected to the pins.
+
+### ~ hint
+
+#### How servos work
+
+To better understand how servos work and how they are controlled, take a few minutes to read this [Brief Guide to Servos](https://www.kitronik.co.uk/pdf/a-brief-guide-to-servos.pdf).
+
+Also, watch this video for a further look into how motors and servos work.
+
+https://www.youtube.com/watch?v=okxooamdAP4
+
+### ~
+
+## Blocks in this extension
+
+```cards
+servos.P0.setPulse(1500)
+servos.P0.setAngle(90)
+servos.P0.run(50)
+servos.P0.stop()
+servos.P0.setRange(0, 180)
+servos.P0.setStopOnNeutral(false)
+```
+
+## See also
+
+[set pulse](/reference/servos/set-pulse),
+[set angle](/reference/servos/set-angle),
+[run](/reference/servos/run),
+[stop](/reference/servos/stop),
+[set range](/reference/servos/set-range),
+[set stop on neutral](/reference/servos/set-stop-on-neutral)
+
+[Brief Guide to Servos](https://www.kitronik.co.uk/pdf/a-brief-guide-to-servos.pdf)
+
+```package
+servo
+```