difftool: fix word spacing in the usage strings
Remove spaces in `non - zero` and add a space between the diff format/mode and option parentheses in difftool's usage strings. Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Junio C Hamano

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