[snapshot] Update list of snapshot apis to include info details

bash-4.2$ ozone sh snapshot info --help
Usage: ozone sh snapshot info [-hV] <value> <snapshotName>
returns information about an existing snapshot
      <value>          URI of the volume/bucket.
                       Ozone URI could either be a full URI or short URI.
                       Full URI should start with o3://, in case of non-HA
                       clusters it should be followed by the host name and
                       optionally the port number. In case of HA clusters
                       the service id should be used. Service id provides a
                       logical name for multiple hosts and it is defined
                       in the property ozone.om.service.ids.
                       Example of a full URI with host name and port number
                       for a key:
                       o3://omhostname:9862/vol1/bucket1/key1
                       With a service id for a volume:
                       o3://omserviceid/vol1/
                       Short URI should start from the volume.
                       Example of a short URI for a bucket:
                       vol1/bucket1
                       Any unspecified information will be identified from
                       the config files.      <snapshotName>   Snapshot name
  -h, --help           Show this help message and exit.
  -V, --version        Print version information and exit.