[dcl.attr.likelihood] Fix error in example

Author: gamecentric

source/declarations.tex

@@ -4079,7 +4079,7 @@
     g(1);
     [[fallthrough]];
 
-  [[likely]] case 2:            // \tcode{n == 3} is considered to be arbitrarily more
+  [[likely]] case 2:            // \tcode{n == 2} is considered to be arbitrarily more
     g(2);                       // likely than any other value of \tcode{n}
     break;
   }