Update draft-marchan-kdl2.md

Co-authored-by: Tab Atkins Jr. <[email protected]>

Author: zkat

draft-marchan-kdl2.md

@@ -319,6 +319,7 @@ example: `10.0#u8` is invalid syntax without the `#` prefix.
 
 Note again that, unlike Bare Suffixes, Explicit Suffixes may be used with ALL
 ({{number}}) formats (hexadecimal, decimal, octal, and binary).
+For example, `0x1234#u16` is valid.
 
 ### Reserved Type Annotations for Numbers Without Decimals