fix: formatting issues in docstrings (#32265)

Ensures proper reStructuredText formatting by adding the required blank
line before closing docstring quotes, which resolves the "Block quote
ends without a blank line; unexpected unindent" warning.

libs/core/langchain_core/beta/runnables/context.py

@@ -363,6 +363,7 @@ class Context:
             print(output["result"])  # Output: "hello"
             print(output["context"])  # Output: "What's your name?"
             print(output["input"])  # Output: "What's your name?
+
     """
 
     @staticmethod