[Toybox] [PATCH] cmp/env/nice/nohup/sort: use TOYFLAG_ARGFAIL.

[enh]

Also be a bit more consistent about `COMMAND [ARG...]` in usage text.
---
 tests/cmp.test      | 6 ++++--
 tests/env.test      | 2 ++
 tests/sort.test     | 1 +
 toys/other/chroot.c | 9 ++++++---
 toys/posix/cmp.c    | 3 +--
 toys/posix/env.c    | 4 ++--
 toys/posix/nice.c   | 8 +++++---
 toys/posix/nohup.c  | 6 ++++--
 toys/posix/sort.c   | 3 ++-
 9 files changed, 27 insertions(+), 15 deletions(-)
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