If that's the only issue, you can do:
/*/ Version one, currently commented
/*/ Version two, currently active /**/
And a single star switches from version two to version one.But I agree this shouldn't be left in production code; it's just a handy trick for switching between two blocks of code†. An #ifdef is also good, but that's C/C++ only.
† Whoever suggested that some editors can comment a block of code missed the point utterly - which is to switch between code blocks easily.