Section for "Power Supply Architecture V2" has not been written

[microbit-carlos]

dev-docs/hardware/powersupply.md

Lines 106 to 107 in a3a2f36

	### Power Supply Architecture V2 TBC
	<!-- TODO -->

Page in tech website:

• https://tech.microbit.org/hardware/powersupply/#power-supply-architecture-v2-tbc

[microbit-carlos]

There is also this TODO:

dev-docs/hardware/powersupply.md

Lines 61 to 64 in a3a2f36

	### USB Powering
	<!-- TODO: Update these paragraphs to detail that 270mA is TBC budget for V2 -->