Removed deprecation of `Press Key` keyword

[emanlove]

Reverted keyword documentation on Press Key. Also added note telling about the differing underlying methods and to try the other if the one used does not work.

[aaltat]

One can always write RoboTidy transformer to ease the transition from old keyword to new one

[emanlove]

I would like to, eventually, transition the keyword, either to new name or a single keyword where one selects the underlying method used to send/press/input keys.