docs: add aliases for in{,b,w,l} and out{,b,w,l}

[mkroening]

With this PR you can find PortRead::read_from_port and PortWrite::write_to_port via in{,b,w,l} and out{,b,w,l} respectively.

[Freax13]

Good idea!

Shouldn't we rather add the aliases to Port::read and Port::write though since those are the methods users are most likely to use? There seem to be some people implementing PortRead/PortWrite themselves for their own types, but I would guess that there are more uses of Port::read/Port::write.

[mkroening]

Shouldn't we rather add the aliases to Port::read and Port::write though since those are the methods users are most likely to use?

Good point! I changed it. 👍

[phil-opp]

Thanks!