in "author and reviewer meet" section: include language about cultural differences

[NickleDave]

more feedback from Collab22:
in "author and reviewer meet" section of "perform code review", should have language re-iterating that author and reviewer should have conversations about and agree on what is "safe" and how they prefer to receive feedback

being prescriptive about what is risky, what is safe
re: cultural differences
some ppl might prefer more direct feedback

ofc, ppl can have different communication styles for many reasons but one is cultural differences that may go unconsidered

Both @RaoOfPhysics and Matt Alexandrakis made similar points in our discussion
(again tagging to credit later when possible, couldn't find a GH profile for Matt who is an RSE at QMUL)