Docs: Mention vec![x; len] syntax in Vec<T> docs, fix inconsistent use #27375
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Noticed that syntax like
vec![0; 5]
is never mentioned inVec<T>
's docs, nor used in any of its methods' docs, so I figured I should add a mention of it. Also noticedvec!(1, 2)
being used in one spot while I was at it, so I fixed that as well for consistency's sake.r? @steveklabnik