Trivial: Fix two VarInt examples in serialize.h

Author: cbarcenas

src/serialize.h

@@ -322,8 +322,8 @@ uint64_t ReadCompactSize(Stream& is)
  * 0:         [0x00]  256:        [0x81 0x00]
  * 1:         [0x01]  16383:      [0xFE 0x7F]
  * 127:       [0x7F]  16384:      [0xFF 0x00]
- * 128:  [0x80 0x00]  16511: [0x80 0xFF 0x7F]
- * 255:  [0x80 0x7F]  65535: [0x82 0xFD 0x7F]
+ * 128:  [0x80 0x00]  16511:      [0xFF 0x7F]
+ * 255:  [0x80 0x7F]  65535: [0x82 0xFE 0x7F]
  * 2^32:           [0x8E 0xFE 0xFE 0xFF 0x00]
  */