The option name "--store" was used early in development, but
never even made it into an applied patch, let alone a
released version of git. I forgot to update the matching
documentation at the time, though.
Noticed-by: Jesse Hopkins <email@example.com>
Signed-off-by: Jeff King <firstname.lastname@example.org>
Signed-off-by: Junio C Hamano <email@example.com>