Update ADK doc according to issue #1650 - 2

[adk-bot]

2. Create new documentation for the Parameter Manager integration

Doc file: docs/integrations/parameter-manager.md

Current state:

(File does not exist)

Proposed Change:

Create a new integration page for Parameter Manager.
Add catalog frontmatter (e.g. catalog_title: Parameter Manager, catalog_description: A client for interacting with Google Cloud Parameter Manager.).
Show how to initialize the ParameterManagerClient:

from google.adk.integrations.parameter_manager.parameter_client import ParameterManagerClient

# Using default credentials
client = ParameterManagerClient()

# Or with a service account json string
client = ParameterManagerClient(service_account_json="...")

# Or with an auth token
client = ParameterManagerClient(auth_token="...")

Explain how to retrieve a parameter:

value = client.get_parameter("projects/my-project/locations/global/parameters/my-param/versions/latest")

Reasoning:
A new ParameterManagerClient was introduced to fetch configuration and parameters securely from Google Cloud. Documenting it under integrations makes it discoverable for users building robust cloud-based agents.

Reference: src/google/adk/integrations/parameter_manager/parameter_client.py

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[zyantw]

Information Architecture:
New article, I would add it in Integrations as well, there would be an indexed section: 1. Agent Identity Integration, 2. Parameter Manager Integration

Usefulness to devs and technical correctness:

• I noticed several mistakes such as ellipsis instead of useful examples.
• I did improvements in the style for the authentication examples.

My next step would be validating the code with Critique or VS and if there are mistakes solve it with the SME. Ask the SME to provide useful examples instead of ellipsis, and to validate that the import path is correct. @joefernandez

2. Create new documentation for the Parameter Manager integration

Proposed Change:

Create a new integration page for Parameter Manager.
Add catalog frontmatter (e.g. catalog_title: Parameter Manager, catalog_description: A client for interacting with Google Cloud Parameter Manager.).
To initialize ParameterManagerClient choose one of the following authentication methods:

from google.adk.integrations.parameter_manager.parameter_client import ParameterManagerClient

# Option A: Default credentials:
client = ParameterManagerClient()

# Option B: Service Account:
client = ParameterManagerClient(service_account_json=SERVICE_ACCOUNT_JSON)

# Option C: Auth token:
client = ParameterManagerClient(auth_token=AUTH_TOKEN)

Explain how to retrieve a parameter:

value = client.get_parameter("projects/my-project/locations/global/parameters/my-param/versions/latest")

Reference: src/google/adk/integrations/parameter_manager/parameter_client.py