completion: regression fix for zsh

zsh completion wrapper doesn't reimplement __gitcompadd(). Although it
should be trivial to do that, let's use __gitcomp_nl() which achieves
exactly the same thing, specially since the suffix ($4) has to be empty.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
remote-hg: trivial configuration note cleanup

Follow the style of the previous configurations.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
remote-hg: fix order of configuration comments

The other configurations were added in the wrong place.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>