Add a search anchor for "OOP" (closes #724)
Add a search anchor for "OOP" (closes #724)

See https://github.com/perl6/doc/issues/724#issuecomment-264547682
MasterDuke17/doc,gfldex/doc,MasterDuke17/doc,tbrowder/doc,stmuk/doc,jonathanstowe/doc,jonathanstowe/doc,gfldex/doc,jonathanstowe/doc,stmuk/doc,dmaestro/doc,gfldex/doc,MasterDuke17/doc,dmaestro/doc,tbrowder/doc,stmuk/doc,dmaestro/doc,antquinonez/doc,perl6/doc,jonathanstowe/doc,dmaestro/doc,perl6/doc,antquinonez/doc,perl6/doc,perl6/doc,perl6/doc,tbrowder/doc,antquinonez/doc,gfldex/doc,jonathanstowe/doc,gfldex/doc,antquinonez/doc,dmaestro/doc,stmuk/doc,MasterDuke17/doc,tbrowder/doc,stmuk/doc,antquinonez/doc