Fixed duplicate line and added examples to is-prime, expmod and unival
Fixed duplicate line and added examples to is-prime, expmod and unival

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