I's a matter of clarity. Yes, the meaning of the comment in the wp-config.php file is obvious — once you've read the WordPress codex. If you never saw that section of the codex, you are likely to overlook the precise meaning of that cryptic comment!
If the comment were as clear as the codex, I wouldn't have made a big deal over this. It is a big deal, and it needs to be emphasized in order to prevent unnecessary problems in getting SSL to work with WordPress. Taking just a few minutes to include clear instructions now could save you hours of technical support time later.
This reminds me of a saying I learned from my father: Clear communication isn't about expressing yourself so that you can be understood — it's about expressing yourself so that you cannot possibly be misunderstood.
So there! :) Now who's LOLing out loud?!?! :) :)