submodule-helper: fix usage string
The missing space at the end of the line makes the closing square bracket sticking to the dash in the next line Found during localisation v2.36.0 round 1 Signed-off-by: Fangyi Zhou <me@fangyi.io> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Junio C Hamano

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