typo on hardware/index.md

[sehodges]

There's a typo in this figure:

it should of course say 'indicator' in both places, not 'indictator'.

I've used that figure in lectures for a few years and only just noticed 😬.

While you're there, I think it makes sense to

• add '- Application processor' underneath Nordic nRF52833-QIAA to mirror the '- USB interface chip' underneath the other Nordic nFR528xx text.
• add '- Motion sensor' underneath ST LSM303AGR.
• make the 'ST LSM303AGR' text a bit smaller, to match the Nordic chip part numbers (e.g. Nordic nRF52833-QIAA).

Steve