CNV- 58842: Added <shortdesc> to Live Migration sections

[Vaishali-gif-rh]

Version(s): 4.16+

Issue: https://issues.redhat.com/browse/CNV-58842

Link to docs preview: https://102800--ocpdocs-pr.netlify.app/openshift-enterprise/latest/virt/live_migration/virt-initiating-live-migration.html

QE review:

• [ ] QE has approved this change.

Additional information: QE approval is not required.

[ocpdocs-previewbot]

🤖 Wed Dec 17 13:00:27 - Prow CI generated the docs preview:

https://102800--ocpdocs-pr.netlify.app/openshift-enterprise/latest/virt/live_migration/virt-initiating-live-migration.html https://102800--ocpdocs-pr.netlify.app/openshift-rosa-hcp/latest/virt/live_migration/virt-initiating-live-migration.html https://102800--ocpdocs-pr.netlify.app/openshift-rosa/latest/virt/live_migration/virt-initiating-live-migration.html

[openshift-ci[bot]]

@Vaishali-gif-rh: all tests passed!

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