docs: myscale code typo (#21522)

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docs/docs/integrations/providers/myscale.mdx

@@ -35,7 +35,7 @@ There are two ways to set up parameters for myscale index.
 
     ```python
     from langchain_community.vectorstores import MyScale, MyScaleSettings
-    config = MyScaleSetting(host="<your-backend-url>", port=8443, ...)
+    config = MyScaleSettings(host="<your-backend-url>", port=8443, ...)
     index = MyScale(embedding_function, config)
     index.add_documents(...)
     ```