Rollup merge of #147489 - chenyukang:yukang-prefer-repeat-n, r=Kivooeo,oli-obk

Prefer to use repeat_n over repeat().take()

More from https://github.com/rust-lang/rust/pull/147464, but batch processed with `ast-grep` to find and replace.

second commit add notes for library: affaf532f9

r? ``@RalfJung``

compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/static_impl_trait.rs

@@ -305,7 +305,7 @@ fn make_elided_region_spans_suggs<'a>(
                 consecutive_brackets += 1;
             } else if let Some(bracket_span) = bracket_span.take() {
                 let sugg = std::iter::once("<")
-                    .chain(std::iter::repeat(name).take(consecutive_brackets).intersperse(", "))
+                    .chain(std::iter::repeat_n(name, consecutive_brackets).intersperse(", "))
                     .chain([">"])
                     .collect();
                 spans_suggs.push((bracket_span.shrink_to_hi(), sugg));