Add a paragraph about the swapped sides in a --merge rebase, which was
otherwise only documented in the sources.
Add a paragraph about the effects of the 'ours' strategy to the -s
description. Also remove the mention of the 'octopus' strategy, which
was copied from the git-merge description but is pointless in a
rebase.
Signed-off-by: Thomas Rast <trast@student.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>