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Rollup merge of #66094 - ArturKovacs:fix-count-doc, r=Dylan-DPC

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Fix documentation for `Iterator::count()`.

The documentation of std::core::Iterator::count() stated that the number returned is the number of times `next` is called on the iterator. However this is not true as the number of times `next` is called is exactly one plus the number returned by `count()`.
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Yuki Okushi 2019-11-13 22:09:11 +09:00 committed by GitHub
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src/libcore/iter/traits/iterator.rs
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@ -201,12 +201,13 @@ pub trait Iterator {
/// Consumes the iterator, counting the number of iterations and returning it.
///
/// This method will evaluate the iterator until its [`next`] returns
/// [`None`]. Once [`None`] is encountered, `count()` returns the number of
/// times it called [`next`].
/// This method will call [`next`] repeatedly until [`None`] is encountered,
/// returning the number of times it saw [`Some`]. Note that [`next`] has to be
/// called at least once even if the iterator does not have any elements.
///
/// [`next`]: #tymethod.next
/// [`None`]: ../../std/option/enum.Option.html#variant.None
/// [`Some`]: ../../std/option/enum.Option.html#variant.Some
///
/// # Overflow Behavior
///