Update MCDU data page

[Valastiri]

As indicated by Shomas the following page has out of date information.

• https://docs.flybywiresim.com/pilots-corner/a32nx-briefing/mcdu/data/#ac-status

Reference A32NX PR:

• https://github.com/flybywiresim/aircraft/pull/7781

Validate the rest of the page for outdated information.