Clean up tr/// Perl 5 docs
Clean up tr/// Perl 5 docs

- Remove mentions of speculations
- Just link to Str.trans for docs
- Mention TR///

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