Merge topic 'tutorial-typos'

abee191e93 Help/tutorial: reword Installation Commands intro
15bd933fc4 Help/tutorial: fix minor typos

Acked-by: Kitware Robot <kwrobot@kitware.com>
Reviewed-by: Vito Gamberini <vito.gamberini@kitware.com>
Acked-by: Betsy McPhail <betsy.mcphail@kitware.com>
Merge-request: !12199