Instead of listing short option (e.g. "-U<n>") as a shorthand for its
longer counterpart (e.g. "--unified=<n>"), list the synonyms together. It
saves one indirection to find what the reader wants.
Signed-off-by: jidanni <jidanni@jidanni.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>