Fixed typo, rebased

library/core/src/fmt/num.rs

@@ -89,7 +89,7 @@ unsafe trait GenericRadix: Sized {
             }
         }
         // SAFETY: `curr` is initialized to `buf.len()` and is only decremented, so it can't overflow. It is
-        // decremented exactly once for each digit. Since u128 is the widest fixed width integer format dupported,
+        // decremented exactly once for each digit. Since u128 is the widest fixed width integer format supported,
         // the maximum number of digits (bits) is 128 for base-2, so `curr` won't underflow as well.
         let buf = unsafe { buf.get_unchecked(curr..) };
         // SAFETY: The only chars in `buf` are created by `Self::digit` which are assumed to be