Glossary: remove items with no description if doced elsewhere
Glossary: remove items with no description if doced elsewhere

For example, remove stuff that is tied to a type (per discussion on #622)

antquinonez/doc,jonathanstowe/doc,MasterDuke17/doc,tbrowder/doc,dmaestro/doc,tbrowder/doc,gfldex/doc,MasterDuke17/doc,MasterDuke17/doc,perl6/doc,gfldex/doc,stmuk/doc,jonathanstowe/doc,gfldex/doc,dmaestro/doc,perl6/doc,stmuk/doc,antquinonez/doc,jonathanstowe/doc,dmaestro/doc,dmaestro/doc,antquinonez/doc,stmuk/doc,perl6/doc,antquinonez/doc,perl6/doc,stmuk/doc,stmuk/doc,jonathanstowe/doc,tbrowder/doc,MasterDuke17/doc,tbrowder/doc,gfldex/doc,gfldex/doc,dmaestro/doc,perl6/doc,antquinonez/doc,jonathanstowe/doc