Document additional panic codes.

docs/reference/control/assert.md

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+# assert
+
+Stop the program if the assertion condition is false.
+
+```sig
+control.assert(false)
+```
+
+You can insist that your program will stop at an assert block if a certain condition you check is false. The error number in the assert is written to the serial port with a failure message.
+
+## Parameters
+
+* **cond**: a [boolean](/types/boolean) where true means everything is ok or false which means, stop the program!
+* **msg**: an optional [string](/types/string) with a message describing the failed assertion.
+
+## Example
+
+Stop the program if a sensor connected to pin `P0` sends a low (`0`) signal.
+
+```blocks
+basic.forever(() => {
+    control.assert(pins.digitalReadPin(DigitalPin.P0) == 1)
+    basic.pause(1000)
+})
+```
+
+## See also
+
+[panic](/reference/control/panic)

docs/reference/control/panic.md

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+# panic
+
+Display an error number and stop the program.
+
+```sig
+control.panic(0)
+```
+
+If your board has some way to display error information, ``||control:panic||`` will work
+with it to show error numbers.
+
+Your program stops when you use ``||control:panic||``. Use this when you think something bad enough has
+happened and your program can't run properly anymore.
+
+## Parameters
+
+* **code**: an error [number](/types/number) you match to an error situation in your program.
+
+### ~hint
+**System error codes**
+
+The @boardname@ has error codes reserved for use by the system software. The ```panic()``` function is for advanced usage only. You must carefully chose an error code that doesn't match one currently used by the @boardname@ system.
+### ~
+
+## Example
+
+Send a 'code red' error that you created to the error display if the input from pin `P0` is lower than `10`.
+
+```blocks
+let codeRed = 1110;
+let codeBlue = 1111;
+
+if (pins.analogReadPin(AnalogPin.P0) < 10) {
+    control.panic(codeRed)
+}
+```
+
+## See also
+
+[assert](/reference/control/assert), [error codes](/device/error-codes)