[glossary.pod] Fixed a couple of errors spotted by raiph++
[glossary.pod] Fixed a couple of errors spotted by raiph++

Fixed two typos and s/native/builtin/ in an example, because there are
no native 'str's.

dha/doc,antquinonez/doc,jkeenan/doc,antquinonez/doc,stmuk/doc,perl6/doc,stmuk/doc,dmaestro/doc,vadz/doc,dnmfarrell/doc,tbrowder/doc,MasterDuke17/doc,hoelzro/perl6-doc,cygx/doc,dmaestro/doc,hoelzro/perl6-doc,jkeenan/doc,hoelzro/perl6-doc,dnmfarrell/doc,MadcapJake/doc,MasterDuke17/doc,gfldex/doc,muraiki/doc,MadcapJake/doc,tbrowder/doc,tbrowder/doc,perl6/doc,jkeenan/doc,LLFourn/doc,dnmfarrell/doc,jonathanstowe/doc,LLFourn/doc,dha/doc,LLFourn/doc,gfldex/doc,MadcapJake/doc,dnmfarrell/doc,jkeenan/doc,LLFourn/doc,jonathanstowe/doc,MadcapJake/doc,gfldex/doc,jkeenan/doc,cygx/doc,muraiki/doc,gfldex/doc,cygx/doc,antquinonez/doc,MasterDuke17/doc,MadcapJake/doc,MasterDuke17/doc,dha/doc,tbrowder/doc,antquinonez/doc,muraiki/doc,dmaestro/doc,dha/doc,hoelzro/perl6-doc,muraiki/doc,stmuk/doc,cygx/doc,cygx/doc,hoelzro/perl6-doc,perl6/doc,stmuk/doc,gfldex/doc,vadz/doc,muraiki/doc,stmuk/doc,jonathanstowe/doc,dmaestro/doc,LLFourn/doc,antquinonez/doc,dha/doc,perl6/doc,dnmfarrell/doc,perl6/doc,vadz/doc,dmaestro/doc,jonathanstowe/doc,jonathanstowe/doc