docs: 更新 lighter-python-main 文档，添加示例代码和 API 说明，重构部分内容以提高可读性

docs/lighter/lighter-python-main/docs/SimpleOrder.md

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+# SimpleOrder
+
+
+## Properties
+
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**order_index** | **int** |  | 
+**order_id** | **str** |  | 
+**owner_account_index** | **int** |  | 
+**initial_base_amount** | **str** |  | 
+**remaining_base_amount** | **str** |  | 
+**price** | **str** |  | 
+**order_expiry** | **int** |  | 
+
+## Example
+
+```python
+from lighter.models.simple_order import SimpleOrder
+
+# TODO update the JSON string below
+json = "{}"
+# create an instance of SimpleOrder from a JSON string
+simple_order_instance = SimpleOrder.from_json(json)
+# print the JSON string representation of the object
+print(SimpleOrder.to_json())
+
+# convert the object into a dict
+simple_order_dict = simple_order_instance.to_dict()
+# create an instance of SimpleOrder from a dict
+simple_order_from_dict = SimpleOrder.from_dict(simple_order_dict)
+```
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+