Fix non-existent workflow builder API references in multi-agent workflows docs

[Copilot]

Two sections in 04-AgentsWithMAF/03-multi-agent-workflows.md reference APIs that don't exist in microsoft.agents.ai.workflows. The actual AgentWorkflowBuilder surface is: BuildSequential, BuildConcurrent, CreateHandoffBuilderWith, CreateGroupChatBuilderWith.

Changes

• Part 4 (Handoff Workflow): Replace AgentWorkflowBuilder.BuildHandoff() (doesn't exist) with CreateHandoffBuilderWith().WithHandoffs().Build()
• Part 6 (Custom Workflow Graphs → Conditional Handoff Workflows): Remove entirely fictitious WorkflowBuilder / AddAgent / AddEdge / AddConditionalEdge APIs. Replace with the actual CreateHandoffBuilderWith pattern—conditional routing is expressed via agent instructions; WithHandoff() constrains the allowed paths.

// Part 4 — corrected
Workflow handoff = AgentWorkflowBuilder.CreateHandoffBuilderWith(generalSupport)
    .WithHandoffs(generalSupport, [billingSpecialist, technicalSupport])
    .WithHandoff(billingSpecialist, generalSupport)
    .Build();

// Part 6 — replaces the WorkflowBuilder graph API that never existed
Workflow customWorkflow = AgentWorkflowBuilder.CreateHandoffBuilderWith(intakeAgent)
    .WithHandoffs(intakeAgent, [simpleAgent, complexAgent])
    .WithHandoff(simpleAgent, responderAgent)
    .WithHandoff(complexAgent, responderAgent)
    .Build();

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[elbruno]

@copilot check if any other workflow sample or docs needs to be updated, and apply the changes

[Copilot]

@copilot check if any other workflow sample or docs needs to be updated, and apply the changes

Checked all other docs and samples in the repo for incorrect workflow API usage (BuildHandoff, WorkflowBuilder, AddAgent, AddEdge, AddConditionalEdge). No additional files need updating — the two fixes in commit 8835715 covered everything. All other files (04-model-context-protocol.md, MAF-MultiAgents/README.md, MAF-MultiModel/README.md, and all .cs samples) correctly use BuildSequential, BuildConcurrent, or CreateHandoffBuilderWith.