[Feature Engineering] Competition submission instructions out of date

[ryanholbrook]

Instructions for competition submission (specifically steps 3 and 4) in https://www.kaggle.com/ryanholbrook/feature-engineering-for-house-prices
are out of date since the competition submission process has been simplified and the ellipsis menu now allows you to directly select submit to competition.

This will need to be updated in the learntools macro as well.