Draft: [ENH] removal of the empty shells in features that are not meant to have help texts

removal of the empty shells in features that are not meant to have help texts because the they really make for inconsistent look and feel of the admin UI.

Here's a link where those features are listed : https://dev.tiki.org/item7430-Missing-help-text-in-lib-prefs-feature-php

And if in the future we intend to add help texts for these features, there will be also no problem.