Re-order the peer review checklist into a more logical order

[timhunt]

At least, this seems more logical to me:

• Move the checkes that are more overall to the end.
• Group all the UI, and DB/performance together.

Also, add mention of developer_notes label which I always forget.

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[timhunt]

If this is accespted, then we shold updated the Peer review canned response in the tracker to match.

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[sarjona]

Hi @timhunt!
Thanks for sharing this proposal. I agree the order makes more sense and it's also great you improved docs. Well done! <3

@wildgirl could you help us upgrading the canned response in the Tracker with the new order? :-)