cubicweb #15956312 RQL documentation doesn't look good [validation pending]

The paragraph "About the negation operator (NOT)" doesn't look good in a web browser:
http://cubicweb.readthedocs.io/en/3.23/book/annexes/rql/language/#restrictions
See attached screen capture (if I can attach a file). Cannot identify what the problem is in the doc sources.

prioritynormal
typebug
done in3.24.4
load0.000
load left0.000
closed by<not specified>
attachment