I don't think this is the only place where we say // \expos in an itemdecl; why do you want to remove it just in these few cases? I think we might want a more general discussion/decision if we want to make any changes here, but I also don't consider that terribly pressing.

Editorial meeting consensus: See also #5498, we seem to have agreed to have \expos comments only in the synopsis, and never later on. We should record that in the wiki and clean up. This PR is a good part of that.

Added to the wiki.