sci-electronics/ngspice-27: remove "should be looked at" comments

sci-electronics/ngspice-27: remove "should be looked at" comments

According to upstream maintainers on ngspice-devel:
 - nodelimiting, predictor and newtrunc "should never be used (not
   maintained, probably buggy, not useful)";
 - adms "will probably get an update for the next release and should be
   considered only then".

Note that according to same ndev is now obsolete as well, we should
consider either disabling it or making it optional in the future.

Package-Manager: Portage-2.3.13, Repoman-2.3.3