OCPBUGS#11815: required Azure parameters

Author: xenolinux

modules/installation-configuration-parameters.adoc

@@ -1070,7 +1070,7 @@ Additional Azure configuration parameters are described in the following table:
 |String, for example `production_disk_encryption_set`.
 
 |`compute.platform.azure.osDisk.diskEncryptionSet.subscriptionId`
-|Optional. The ID of a disk encryption set in another Azure subscription. This secondary disk encryption set will be used to encrypt compute machines. By default, the installation program will use the disk encryption set from the Azure subscription ID that you provided to the installation program prompts.
+|Defines the Azure subscription of the disk encryption set where the disk encryption set resides. This secondary disk encryption set is used to encrypt compute machines.
 |String, in the format `00000000-0000-0000-0000-000000000000`.
 
 |`controlPlane.platform.azure.encryptionAtHost`
@@ -1086,7 +1086,7 @@ Additional Azure configuration parameters are described in the following table:
 |String, for example `production_disk_encryption_set`.
 
 |`controlPlane.platform.azure.osDisk.diskEncryptionSet.subscriptionId`
-|Optional. The ID of a disk encryption set in another Azure subscription. This secondary disk encryption set will be used to encrypt control plane machines. By default, the installation program will use the disk encryption set from the Azure subscription ID that you provided to the installation program prompts.
+|Defines the Azure subscription of the disk encryption set where the disk encryption set resides. This secondary disk encryption set is used to encrypt control plane machines.
 |String, in the format `00000000-0000-0000-0000-000000000000`.
 
 |`controlPlane.platform.azure.osDisk.diskSizeGB`