Update calibrate-compass.md (#2265)

Based on user feedback in Slack https://microbit-community.slack.com/archives/C1ZMKRFHD/p1563274019078400?thread_ts=1563268925.077500&cid=C1ZMKRFHD
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Mark 2019-07-16 14:30:18 +01:00 committed by Peli de Halleux
parent b0954f659f
commit bb3b01a0b0

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@ -11,6 +11,10 @@ input.calibrateCompass();
The calibration will ask you to draw a circle or fill the LED screen by tilting the
@boardname@.
The compass calibration is stored in memory by the @boardname@, so next time you press the reset button or remove and replace the power the calibration will be remembered.
When you flash a new program to your @boardname@ via USB, this memory is cleared so you will have to re-calibrate it.
If you are calibrating or using the compass near metal, it might
confuse the @boardname@.