Tone of 5-6 articles

[coke]

These definitely feel like they were written by someone outside the 6/Raku community and we pulled them in without doing a strong edit pass on them.

TODOs, "not fully docced", "this is not specifically documented".

Better to have the minimum descriptive text or comment out sections that we don't feel offer any info.

[jonathanstowe]

Yep, they were originally made by David Adler in 2015/2016 (the original material is at https://github.com/dha/perl5-to-perl6-docs,)

[coke]

bd19ab2 (simple pass)