DUCC Book documentation is missing for several new commands introduced in release 2.2.0.
> add ducc_gather_logs to admin
> move ducc_disk_info from bin to admin
> refer build_duccling to install section.
Add admin commands missing from doc too.
> ducc_disk_info should be under admin
> ducc_status should be under bin
> ducc_watcher should be under bin
> Add doc for tools/ducc_watcher
> Add doc for tools/ducc_disk_info
> Add doc for tools/ducc_status