Fix: faulty segmentation of embedded code-comments

SSDD - Same shit, different day. During preparation of another pull-request I discovered that my last fix regarding embeddable code-comments ( https://github.com/nevir/groc/pull/110 ) was not yet complete … there was still code cruft left, that I removed now, in order to improve the overall visual appearance, especially in the narrowed single-column view.

To sum it up - this patch has no new code, it just removes three lines of code. Everything else are new, updated or more precise comments, clarifying what is going on.

Thanks in advance for not loosing your head … :grin: 
Stephan