Add model override docs

Author: Unshure

docs/user-guide/concepts/experimental/agent-config.md

@@ -61,7 +61,7 @@ agent = config_to_agent("file:///path/to/config.json")
 
 ### Supported Keys
 
-- `model`: Model identifier (string) - see [model provider documentation](https://strandsagents.com/latest/user-guide/quickstart/#using-a-string-model-id)
+- `model`: Model identifier (string) - [[Only supports AWS Bedrock model provider string](../../../quickstart/#using-a-string-model-id)]
 - `prompt`: System prompt for the agent (string)
 - `tools`: List of tool specifications (list of strings)
 - `name`: Agent name (string)
@@ -100,12 +100,51 @@ The Agent class handles all tool loading internally, including:
     agent.process_tools([ToolWithConfigArg(http.client.HTTPSConnection("localhost"))])
     ```
 
+### Model Configurations
+
+The `model` property uses the [string based model id feature](../../../quickstart/#using-a-string-model-id). You can reference [AWS's Model Id's](https://docs.aws.amazon.com/bedrock/latest/userguide/inference-profiles-support.html) to identify a model id to use. If you want to use a different model provider, you can pass in a model as part of the `**kwargs` of the `config_to_agent` function:
+
+```python
+from strands.experimental import config_to_agent
+from strands.models.openai import OpenAIModel
+
+# Create agent from dictionary
+agent = config_to_agent(
+  config={"name": "Data Analyst"},
+  model=OpenAIModel(
+    client_args={
+        "api_key": "<KEY>",
+    },
+    model_id="gpt-4o",
+  )
+)
+```
+
+Additionally, you can override the `agent.model` attribute of an agent to configure a new model provider:
+
+```python
+from strands.experimental import config_to_agent
+from strands.models.openai import OpenAIModel
+
+# Create agent from dictionary
+agent = config_to_agent(
+  config={"name": "Data Analyst"}
+)
+
+agent.model = OpenAIModel(
+  client_args={
+      "api_key": "<KEY>",
+  },
+  model_id="gpt-4o",
+)
+```
+
 ## Function Parameters
 
 The `config_to_agent` function accepts:
 
 - `config`: Either a file path (string) or configuration dictionary
-- `**kwargs`: Additional [Agent constructor parameters](https://strandsagents.com/latest/api-reference/agent/#strands.agent.agent.Agent.__init__) that override config values
+- `**kwargs`: Additional [Agent constructor parameters](../../../../api-reference/agent/#strands.agent.agent.Agent.__init__) that override config values
 
 ```python
 # Override config values with valid Agent parameters