Small change in minio client documentation

[Manojvbhat]

In the Documentation of minio client API reference, for --newer-than flag in mc cp command example is given as --older-than 1d2hh3mm4ss.

Link to the issue #https://min.io/docs/minio/linux/reference/minio-mc/mc-cp.html#mc.cp.-newer-than

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed after 21 days if no further activity occurs. Thank you for your contributions.