Updated README.md file (removed embedded --help command output + fixed small spelling mistakes)

[swissbuechi]

Follow-up for PR: https://github.com/Homebrew/homebrew-autoupdate/pull/114

• Removed embedded --help command output and inserted a link to the auto updated documentation: Homebrew Documentation autoupdate subcommand
• Added an example and recommended start command.
• Fixed some small spelling mistakes

[github-actions[bot]]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[swissbuechi]

not stale

[DomT4]

Thanks again! 🎉