code[patch]: Add in code documentation to core Runnable with_retry method (docs only) (#19192)

- **Description:** Add in code documentation to core Runnable with_retry
method (docs only)
- **Issue:** #18804 
@baskaryan @eyurtsev PTAL

---------

Co-authored-by: ccurme <chester.curme@gmail.com>

libs/core/langchain_core/runnables/base.py

@@ -1344,6 +1344,35 @@ class Runnable(Generic[Input, Output], ABC):
     ) -> Runnable[Input, Output]:
         """Create a new Runnable that retries the original runnable on exceptions.
 
+        Example:
+
+        .. code-block:: python
+            from langchain_core.runnables import RunnableLambda
+
+            count = 0
+
+
+            def _lambda(x: int) -> None:
+                global count
+                count = count + 1
+                if x == 1:
+                    raise ValueError("x is 1")
+                else:
+                     pass
+
+
+            runnable = RunnableLambda(_lambda)
+            try:
+                runnable.with_retry(
+                    stop_after_attempt=2,
+                    retry_if_exception_type=(ValueError,),
+                ).invoke(1)
+            except ValueError:
+                pass
+
+            assert (count == 2)
+
+
         Args:
             retry_if_exception_type: A tuple of exception types to retry on
             wait_exponential_jitter: Whether to add jitter to the wait time