split up 'sem*' header.
split up 'sem*' header.

resolves #1058

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