Fix 11493 - correctly explain code snippet behaviour (#3517)

Signed-off-by: Matei Hriscu <[email protected]>
Co-authored-by: Matei Hriscu <[email protected]>

Author: matthriscu

spec/type.dd

@@ -451,8 +451,8 @@ $(SPEC_RUNNABLE_EXAMPLE_FAIL
 ---
 ubyte  u1 = -1;       // error, -1 cannot be represented in a ubyte
 ushort u2 = -1;       // error, -1 cannot be represented in a ushort
-uint   u3 = int(-1);  // ok, -1 can be represented in a uint
-ulong  u4 = long(-1); // ok, -1 can be represented in a ulong
+uint   u3 = int(-1);  // ok, -1 can be represented in an int, which can be converted to a uint
+ulong  u4 = long(-1); // ok, -1 can be represented in a long, which can covnerted to a ulong
 ---
 )