parseopt: enable subcommand autocorrection for git-remote and git-notes

parseopt: enable subcommand autocorrection for git-remote and git-notes

Add PARSE_OPT_SUBCOMMAND_AUTOCORRECT to enable autocorrection for
subcommands parsed with PARSE_OPT_SUBCOMMAND_OPTIONAL.

Apply this to git-remote and git-notes, so mistyped subcommands can be
automatically corrected, and builtin entry points no longer need to
handle the unknown subcommand error path themselves.

This is safe. Both builtins either resolve to a single subcommand or
take no subcommand at all, meaning any unknown argument encountered by
the parser must be a mistyped subcommand.

Signed-off-by: Jiamu Sun <39@barroit.sh>
Signed-off-by: Junio C Hamano <gitster@pobox.com>