docs: Account transfer() kwargs and basic transfer docs

[mikeshultz]

Consider fleshing out the docs for the transfer() function a bit more. It's pretty basic account functionality and would help ape (console/scripting) be more useful and accessible for basic account operations.

Looking at help(account.transfer) doesn't really explain that the function accepts kwargs that are passed to create_transaction() and call(). So it took me looking at the source (and a blind attempt) to know that I can actually set gas_price for instance.

I also looked at the docs, but the Transactions guide, nor the Accounts guide even mention the transfer() method.

[linear]

APE-1835 docs: Account `transfer()` kwargs and basic transfer docs