Update default recursion_limit, update docs (#12134)

<!-- Thank you for contributing to LangChain!

Replace this entire comment with:
  - **Description:** a description of the change, 
  - **Issue:** the issue # it fixes (if applicable),
  - **Dependencies:** any dependencies required for this change,
- **Tag maintainer:** for a quicker response, tag the relevant
maintainer (see below),
- **Twitter handle:** we announce bigger features on Twitter. If your PR
gets announced, and you'd like a mention, we'll gladly shout you out!

Please make sure your PR is passing linting and testing before
submitting. Run `make format`, `make lint` and `make test` to check this
locally.

See contribution guidelines for more information on how to write/run
tests, lint, etc:

https://github.com/langchain-ai/langchain/blob/master/.github/CONTRIBUTING.md

If you're adding a new integration, please include:
1. a test for the integration, preferably unit tests that do not rely on
network access,
2. an example notebook showing its use. It lives in `docs/extras`
directory.

If no one reviews your PR within a few days, please @-mention one of
@baskaryan, @eyurtsev, @hwchase17.
 -->

libs/langchain/langchain/schema/runnable/config.py

@@ -74,19 +74,20 @@ class RunnableConfig(TypedDict, total=False):
     max_concurrency: Optional[int]
     """
     Maximum number of parallel calls to make. If not provided, defaults to 
-    ThreadPoolExecutor's default. This is ignored if an executor is provided.
+    ThreadPoolExecutor's default.
     """
 
     recursion_limit: int
     """
-    Maximum number of times a call can recurse. If not provided, defaults to 10.
+    Maximum number of times a call can recurse. If not provided, defaults to 25.
     """
 
     configurable: Dict[str, Any]
     """
-    Runtime values for attributes previously made configurable by this Runnable,
+    Runtime values for attributes previously made configurable on this Runnable,
-    or sub-Runnables, through .make_configurable(). Check .output_schema for
+    or sub-Runnables, through .configurable_fields() or .configurable_alternatives().
-    a description of the attributes that have been made configurable.
+    Check .output_schema() for a description of the attributes that have been made 
+    configurable.
     """
 
 
@@ -96,7 +97,7 @@ def ensure_config(config: Optional[RunnableConfig] = None) -> RunnableConfig:
         metadata={},
         callbacks=None,
         locals={},
-        recursion_limit=10,
+        recursion_limit=25,
     )
     if config is not None:
         empty.update(

libs/langchain/tests/unit_tests/schema/runnable/test_runnable.py

@@ -1291,7 +1291,7 @@ async def test_default_method_implementations(mocker: MockerFixture) -> None:
                 tags=[],
                 callbacks=None,
                 locals={},
-                recursion_limit=10,
+                recursion_limit=25,
             ),
         ),
         mocker.call(
@@ -1301,7 +1301,7 @@ async def test_default_method_implementations(mocker: MockerFixture) -> None:
                 tags=[],
                 callbacks=None,
                 locals={},
-                recursion_limit=10,
+                recursion_limit=25,
             ),
         ),
     ]