Update ADK doc according to issue #1048 - 5

docs/tools-custom/openapi-tools.md

@@ -82,3 +82,40 @@ This example demonstrates generating tools from a simple Pet Store OpenAPI spec
     ```python title="openapi_example.py"
     --8<-- "examples/python/snippets/tools/openapi_tool.py"
     ```
+## Advanced Configuration
+
+### Custom Headers with `header_provider`
+
+You can provide a callable to `header_provider` to dynamically add custom headers to every API request. The callable receives the `ReadonlyContext` and should return a dictionary of headers.
+
+```python
+def my_header_provider(context: ReadonlyContext) -> dict[str, str]:
+    return {"X-Request-ID": context.invocation_id}
+
+toolset = OpenAPIToolset(
+    spec_dict=openapi_spec,
+    header_provider=my_header_provider,
+)
+```
+
+### SSL Certificate Verification with `ssl_verify`
+
+You can configure SSL certificate verification for all tools in the toolset using the `ssl_verify` parameter. This is useful for environments with custom CA certificates.
+
+```python
+toolset = OpenAPIToolset(
+    spec_dict=openapi_spec,
+    ssl_verify="/path/to/ca.pem",
+)
+```
+
+### Tool Name Prefix with `tool_name_prefix`
+
+You can add a prefix to all tool names generated by the toolset using the `tool_name_prefix` parameter. This is useful for avoiding name collisions when using multiple OpenAPI specs.
+
+```python
+toolset = OpenAPIToolset(
+    spec_dict=openapi_spec,
+    tool_name_prefix="my_api",
+)
+```