Update INSTALL_OMNIA_CONTROL_PLANE.md

Ghost screen issue not observed on Host having CentOS 8.4 and Cobbler 2.8.5 running on CentOS 7.9 Container.
Few changes are needed in kickstart file which Shubhangi will be doing. Corrected the document.

docs/INSTALL_OMNIA_CONTROL_PLANE.md

@@ -24,7 +24,7 @@ Depending on the pass-through switch configured in your HPC environment, the num
 
 ## Prerequisites to install the Omnia Control Plane version 1.1
 * Ensure that a stable Internet connection is available on management station, manager node, login node, and compute nodes. 
-* CentOS 8.3 is installed on the management station.
+* CentOS 8.4 is installed on the management station.
 * To provision the bare metal servers, go to http://isoredirect.centos.org/centos/7/isos/x86_64/ and download the **CentOS-7-x86_64-Minimal-2009** ISO file.
 * For DHCP configuration, you can provide a host mapping file. If the mapping file is not provided and the variable is left blank, a default mapping file will be created. The provided details must be in the format: MAC address, Hostname, IP address, Component_role. For example, `10:11:12:13,server1,100.96.20.66,compute` and  `14:15:16:17,server2,100.96.22.199,manager` are valid entries.  
 __Note:__  
@@ -290,4 +290,4 @@ To enable the login node, the *login_node_required* variable must be set to "tru
 
 ## Add a new compute node to the cluster
 
-If a new node is provisioned through Cobbler, the node address is automatically displayed on the AWX dashboard. The node is not assigned to any group. You can add the node to the compute group along with the existing nodes and run `omnia.yml` to add the new node to the cluster and update the configurations in the manager node.
+If a new node is provisioned through Cobbler, the node address is automatically displayed on the AWX dashboard. The node is not assigned to any group. You can add the node to the compute group along with the existing nodes and run `omnia.yml` to add the new node to the cluster and update the configurations in the manager node.