Fix typo in number.rs

seperate -> separate

vm/src/function/number.rs

@@ -126,7 +126,7 @@ impl TryFromObject for ArgIntoBool {
     }
 }
 
-// Implement ArgIndex to seperate between "true" int and int generated by index
+// Implement ArgIndex to separate between "true" int and int generated by index
 #[derive(Debug)]
 #[repr(transparent)]
 pub struct ArgIndex {