Improve phrasing thanks to hefee's clarifications (Closes: #16979).
This includes: - Make instructions copy'n'paste-friendly, while taking into account hefee's wish to encourage the reader to, well, read. - Link to the cron.sh that one might have trouble finding otherwise. - Various technical writing nitpicking / style guide compliance. - Fix Markdown so that command lines are not prefixed with spaces once rendered on our website. - Avoid command line being partly hidden without scrolling once rendered on our website.
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