Upgrade documenter, fix doctests #21473
Merged
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run NEWS-update, fix a dead link, add a linkcheck exception for a site that oddly doesn't load correctly from nanosoldier (was previously whitelisted here https://github.com/JuliaLang/julia/blob/v0.5.1/doc/conf.py#L100 but documenter only just added that functionality)