Rollup merge of #81499 - SOF3:patch-1, r=sanxiyn
Updated Vec::splice documentation Replacing with equal number of values does not increase the length of the vec. Reference: https://stackoverflow.com/a/62559271/3990767
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@ -2211,7 +2211,7 @@ impl<T, A: Allocator> Vec<T, A> {
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/// This is optimal if:
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///
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/// * The tail (elements in the vector after `range`) is empty,
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/// * or `replace_with` yields fewer elements than `range`’s length
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/// * or `replace_with` yields fewer or equal elements than `range`’s length
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/// * or the lower bound of its `size_hint()` is exact.
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///
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/// Otherwise, a temporary vector is allocated and the tail is moved twice.
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