Make clear in the documentation that when using --branches/-b and
--prefix with 'init', the prefix must include a trailing slash.
This matches the actual behavior of git-svn, e.g.:
$ git svn init -Ttrunk -treleases -bbranches --prefix xxx \
http://svn.sacredchao.net/svn/quodlibet/
--prefix='xxx' must have a trailing slash '/'
$
This was noticed by R. Vanicat and reported through
http://bugs.debian.org/429443
Signed-off-by: Gerrit Pape <pape@smarden.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>