md2: clarify comments to say that alignment is not required. * lib/md2.h: Remove warning about alignment in comment. * lib/md2.c (md2_read_ctx, md2_finish_ctx): Doc fix, alignment has never been required.

#ifndef USERSPEC_H
# define USERSPEC_H 1

# include <sys/types.h>

const char *
parse_user_spec (const char *spec_arg, uid_t *uid, gid_t *gid,
		 char **username_arg, char **groupname_arg);

#endif