Updating old references

content/handbook/support/_index.md

...ent/handbook/support/support-engineer-responsibilities.md

content/handbook/support/support-time-off.md

content/handbook/support/training/_index.md

content/handbook/support/training/onboarding_buddy.md

...dbook/support/workflows/customer_emergencies_workflows.md

content/handbook/support/workflows/gpt_quick_start.md

content/handbook/support/workflows/how-to-get-help.md

content/handbook/support/workflows/knowledge_areas.md

content/handbook/support/workflows/ooo-ticket-management.md

...ent/handbook/support/workflows/support_manager-on-call.md

content/handbook/support/workflows/upgrade-assistance.md

...nt/handbook/support/workflows/working_with_support_ops.md

...ndbook/support/workflows/zendesk_agent_personalization.md