fix(langgraph): don't use rst code blocks in docstrings (#6231)

CONTRIBUTING.md

@@ -277,9 +277,9 @@ def my_function(arg1: int, arg2: str) -> float:
     Examples:
         This is a section for examples of how to use the function.
 
-        .. code-block:: python
-
-            my_function(1, "hello")
+        ```python
+        my_function(1, "hello")
+        \```
 
     Args:
         arg1: This is a description of arg1. We do not need to specify the type since

libs/langgraph/langgraph/graph/ui.py

@@ -89,13 +89,12 @@ def push_ui_message(
         The created UI message.
 
     Example:
-
-    .. code-block:: python
-
+        ```python
         push_ui_message(
             name="component-name",
             props={"content": "Hello world"},
         )
+        ```
 
     """
     from langgraph._internal._constants import CONFIG_KEY_SEND
@@ -146,10 +145,9 @@ def delete_ui_message(id: str, *, state_key: str = "ui") -> RemoveUIMessage:
         The remove UI message.
 
     Example:
-
-    .. code-block:: python
-
+        ```python
         delete_ui_message("message-123")
+        ```
 
     """
     from langgraph._internal._constants import CONFIG_KEY_SEND
@@ -183,13 +181,12 @@ def ui_message_reducer(
         Combined list of UI messages with removals applied.
 
     Example:
-
-    .. code-block:: python
-
+        ```python
         messages = ui_message_reducer(
             [{"type": "ui", "id": "1", "name": "Chat", "props": {}}],
             {"type": "remove-ui", "id": "1"},
         )
+        ```
 
     """
     if not isinstance(left, list):