langchain_openai[patch]: fix typos in langchain_openai (#17923)

Just a small typo

libs/partners/openai/langchain_openai/chat_models/azure.py

@@ -163,7 +163,7 @@ def validate_environment(cls, values: Dict) -> Dict:
                     "If specifying `azure_deployment`/`deployment_name` then use "
                     "`azure_endpoint` instead of `base_url`.\n\n"
                     "For example, you could specify:\n\n"
-                    'azure_deployment="https://xxx.openai.azure.com/", '
+                    'azure_endpoint="https://xxx.openai.azure.com/", '
                     'deployment_name="my-deployment"\n\n'
                     "Or you can equivalently specify:\n\n"
                     'base_url="https://xxx.openai.azure.com/openai/deployments/my-deployment"'  # noqa: E501