[3.12] gh-112007: Re-organize help utility intro message (GH-112017) (#112047)

gh-112007: Re-organize help utility intro message (GH-112017)

Most important: move how-to-quit sentence to the end and mention 'q'.
Re-group the other sentences and improve some wording.
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(cherry picked from commit b28bb130bbc2ad956828819967d83e06d30a65c5)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>