ls(1): Update POSIX conformance from 2001 to 2008
- Update the options that are non-existing in POSIX 2001 to 2008
- Update POSIX conformance in the STANDARDS section from 2001 to 2008
Verified by [1].
PR: 140435
[1] https://pubs.opengroup.org/onlinepubs/9699919799.2016edition/toc.htm