Merge topic 'tutorial-misc-fixes' into release-4.3

4b093ae12e Tutorial: Move multi-config install note to the first exercise
653356bed0 Tutorial: Describe install prefix
fdc4511f18 Tutorial: Fix some typos

Acked-by: Kitware Robot <kwrobot@kitware.com>
Reviewed-by: Vito Gamberini <vito.gamberini@kitware.com>
Merge-request: !12062