Update optional-to-none-union.md (#753)

Author: ftnext

website/catalog/python/optional-to-none-union.md

@@ -24,16 +24,16 @@ fix: $T | None
 
 <!-- highlight matched code in curly-brace {lineNum} -->
 ```py {1}
-def a(arg: Optional[Int]): pass
+def a(arg: Optional[int]): pass
 ```
 
 ### Diff
 <!-- use // [!code --] and // [!code ++] to annotate diff -->
 ```py
-def a(arg: Optional[Int]): pass # [!code --]
-def a(arg: Int | None): pass # [!code ++]
+def a(arg: Optional[int]): pass # [!code --]
+def a(arg: int | None): pass # [!code ++]
 ```
 
 ### Contributed by
 
-[Bede Carroll](https://github.com/ast-grep/ast-grep/discussions/1492)
+[Bede Carroll](https://github.com/ast-grep/ast-grep/discussions/1492)