Update ADK doc according to issue #1350 - 3

[adk-bot]

3. Update Apigee docs to reflect OpenAI-compatible API support

Doc file: docs/agents/models/apigee.md

Current state:

The ApigeeLLM wrapper is currently designed for use with Vertex AI and the Gemini API (generateContent).

Proposed Change:

Update to state that ApigeeLlm now supports OpenAI-compatible APIs (like /chat/completions). Add examples of how to configure it for OpenAI models using apigee/openai/... model strings or the api_type parameter.

Reasoning:
The ApigeeLlm class was significantly updated to support OpenAI-compatible APIs via Apigee proxies, including a new CompletionsHTTPClient.

Reference: src/google/adk/models/apigee_llm.py

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[jcwriter74]

Update Apigee docs to reflect OpenAI-compatible API support

• Doc file: docs/agents/models/apigee.md

Current state:

The ApigeeLLM wrapper is currently designed for use with Vertex AI and the Gemini API (generateContent).

Proposed Change:

• Update to state that ApigeeLlm now supports OpenAI-compatible APIs (like /chat/completions).
• Add examples of how to configure it for OpenAI models using apigee/openai/... model strings or the api_type parameter.
• The ApigeeLlm class was significantly updated to support OpenAI-compatible APIs via Apigee proxies
• Includes a new CompletionsHTTPClient.

Reference: src/google/adk/models/apigee_llm.py

[jcwriter74]

• About CompletionsHTTPClient, added here:
  https://github.com/google/adk-python/blob/main/src/google/adk/models/apigee_llm.py
• The rest of the proposed changes tasks are here:
  https://github.com/google/adk-docs/pull/1355/changes

[joefernandez]

Closed with: #1848

[joefernandez]

Deleting API Registration and replacing it with Agent Registry is not correct

[joefernandez]

Deleting API Registration and replacing it with Agent Registry is not correct