Clarifying a comment

+semver: major

src/L10NSharp/L10NCultureInfo.cs

@@ -35,10 +35,11 @@ public L10NCultureInfo(string name)
 				RawCultureInfo = null;
 			}
 
-			// Starting with Windows 10, unknown cultures no longer return a RawCultureInfo containing an "Unknown Language" indication.
-			// The proper way to detect fully unknown cultures, for Windows 10 and prior, is to:
+			// Windows 10 changed the behavior of CultureInfo, in that unknown cultures no longer return a RawCultureInfo containing an "Unknown Language" indication.
+			// The proper way to detect fully unknown cultures (for Windows 10 and prior) is to:
 			//    1. Check for the custom culture flag
 			//    2. Check if the three-letter language name is set to default
+			// Source: https://stackoverflow.com/a/71388328/1964319
 			var isFullyUnknown = RawCultureInfo.CultureTypes.HasFlag(CultureTypes.UserCustomCulture) && RawCultureInfo.ThreeLetterWindowsLanguageName == "ZZZ";
 			if (RawCultureInfo == null || isFullyUnknown)
 			{