D12032: Tweak README-KeyTab and README.keyboard a bit

[Kurt Hindenburg]

hindenburg accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R319 Konsole

BRANCH
  keybindings-docs-take-2 (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D12032

To: ahmadsamir, #konsole, hindenburg
Cc: #konsole, herrold, ngraham, hindenburg
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