[CLI-352] Correct HelpFormatter Javadoc

[kdombeck]

Note: I did not update the Javadoc in the old HelpFormatter since that class is deprecated. If you want me to I can either update this PR or create a different one.

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[garydgregory]

@kdombeck

Thank you for your PR. You might as well fix the other Javadoc here since the PR will still be small and on the same theme.

Thank you!

[kdombeck]

might as well fix the other Javadoc here

Done e98489e