[fpc-pascal] Docs - structural change

[fpc at mfriebe.de]

One other issue

https://www.freepascal.org/~michael/docs-demo/docs/sidebar/ref/refse12.html#x25-240003.1

The "this section contains" has almost the same look as code samples.
Well actually, it doesn't have all around border, but that is hardly 
distinguishable.

I am not sure how it might best be displayed, but one possibility might 
be to loose the background color?