Cleanup various spellings of the same argument, as well as the code
for the tilde: Since neither '~' nor '\~' work consistently, use
'{tilde}'.
Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net> Acked-by: Thomas Rast <trast@student.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>