Description of problem:
Wrong path to disks in iscsi taget docs

How reproducible:
100%

Steps to Reproduce:
1. go to https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/3/html/block_device_guide/using_an_iscsi_gateway
2. Start setup using cli https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/3/html/block_device_guide/using_an_iscsi_gateway#configuring_the_iscsi_target_using_the_command_line_interface


Actual results:
Adding a RADOS Block Device (RBD):
Syntax
> cd /iscsi-target/iqn.2003-01.com.redhat.iscsi-gw:<target_name>/disks/
>/disks/ create <pool_name> image=<image_name> size=<image_size>m|g|t
Example
> cd /iscsi-target/iqn.2003-01.com.redhat.iscsi-gw:ceph-igw/disks/
>/disks/ create rbd image=disk_1 size=50g

trying to execute command on nede
/> cd /iscsi-target/iqn.2003-01.com.redhat.iscsi-gw:ceph-igw/disks/
No such path /iscsi-target/iqn.2003-01.com.redhat.iscsi-gw:ceph-igw/disks

Expected results:
correct path to disks "disks/"
Example:
/> cd /disks/
/disks>

Additional info: