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Rollup merge ofrust-lang#127592 - tesuji:patch-1, r=Mark-Simulacrum

doc: Suggest `str::repeat` over `iter::repeat().take().collect()`r? libs

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Original file line number	Diff line number	Diff line change
`@@ -8,11 +8,15 @@ use crate::num::NonZero;`
`8`	`8`	/// Infinite iterators like `repeat()` are often used with adapters like
`9`	`9`	/// [`Iterator::take()`], in order to make them finite.
`10`	`10`	`///`
	`11`	+/// Use [`str::repeat()`] instead of this function if you just want to repeat
	`12`	+/// a char/string `n`th times.
	`13`	`+///`
`11`	`14`	/// If the element type of the iterator you need does not implement `Clone`,
`12`	`15`	`/// or if you do not want to keep the repeated element in memory, you can`
`13`	`16`	/// instead use the [`repeat_with()`] function.
`14`	`17`	`///`
`15`	`18`	/// [`repeat_with()`]: crate::iter::repeat_with
	`19`	+/// [`str::repeat()`]: ../../std/primitive.str.html#method.repeat
`16`	`20`	`///`
`17`	`21`	`/// # Examples`
`18`	`22`	`///`

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