Fix file structure path in design.md from google/ to googleadk/

[Copilot]

The design document showed an incorrect file structure path using google/ instead of the actual implementation path googleadk/. This inconsistency between documentation and code could confuse developers.

Changes:

• Updated file structure section in libraries/microsoft-agents-a365-tooling-extensions-googleadk/docs/design.md to use googleadk/ instead of google/

The corrected path:

microsoft_agents_a365/tooling/extensions/googleadk/
├── __init__.py
└── services/
    ├── __init__.py
    └── mcp_tool_registration_service.py

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