Virtualization docs fixes during ROSA review 2

[mburke5678]

Fixing various errors in the Applications docs as I find them during the ROSA content port. Mostly formatting, wording, and such.

Previews: Creating backup hooks -- Removed stray [] from code example. Installing the Data Protection Application 1.2 and earlier -- Changed the verification header type. Installing the Data Protection Application 1.3 -- Changed the verification header type. Enabling self-signed CA certificates -- Changed ... to # ... Setting Velero CPU and memory resource allocations -- Changed ... to # ... Adding a key when creating a VM from a template -- Changed single step Verification to a bullet Adding a key when creating a VM by using the command line -- Changed single step Verification to a bullet Enabling dynamic key injection when creating a VM from a template -- Changed single step Verification to a bullet Enabling dynamic key injection by using the command line -- Changed single step Verification to a bullet Creating a snapshot by using the command line -- s/v1alpha1/v1alpha1 [ ] QE has approved this change. Defining a guest agent ping probe -- Added code example metadata and fixed YAML spacing. Defining an HTTP liveness probe -- Added code example metadata and fixed YAML spacing. Defining an HTTP readiness probe -- Added code example metadata and fixed YAML spacing. Defining a TCP readiness probe -- Added code example metadata and fixed YAML spacing. PXE booting with a specified MAC address -- Fix formatting in Step 4. Current docs Restoring a VM from a snapshot by using the command line -- s/v1alpha1/v1alpha1 [ ] QE has approved this change. CDIStorageProfilesIncomplete -> Mitigation -- Switched specific object name in code example to generic, in order to match the previous command. Generating a temporary token for the VNC console -- Removed a stray # ... from a command example. Verifying online snapshots by using snapshot indications -- Changed sub-bullets in step 1. It doesn't matter how the snapshots were created. Current docs.
Scheduling virtual machines with a custom scheduler -- Changed formatting to Verification to avoid an odd a numbered substep under a bullet. Current docs.