langchain: Fix class name in RetryOutputParser docstring (#15268)

`OutputFixingParser` -> `RetryOutputParser`



![i'm-helping](https://github.com/langchain-ai/langchain/assets/5986636/68f1b8ce-8a6e-4e75-9cf8-e3c93ac562c2)

libs/langchain/langchain/output_parsers/retry.py

@@ -56,7 +56,7 @@ class RetryOutputParser(BaseOutputParser[T]):
         prompt: BasePromptTemplate = NAIVE_RETRY_PROMPT,
         max_retries: int = 1,
     ) -> RetryOutputParser[T]:
-        """Create an OutputFixingParser from a language model and a parser.
+        """Create an RetryOutputParser from a language model and a parser.
 
         Args:
             llm: llm to use for fixing