Unrolled build for rust-lang#120971

Rollup merge of rust-lang#120971 - PizzasBear:patch-1, r=Nilstrieb

Fix comment in core/src/str/validations.rs

Fix minor issue in the comment

library/core/src/str/validations.rs

@@ -161,7 +161,7 @@ pub(super) const fn run_utf8_validation(v: &[u8]) -> Result<(), Utf8Error> {
  // first E0 A0 80 last EF BF BF
  // excluding surrogates codepoints \u{d800} to \u{dfff}
  // ED A0 80 to ED BF BF
- // 4-byte encoding is for codepoints \u{1000}0 to \u{10ff}ff
+ // 4-byte encoding is for codepoints \u{10000} to \u{10ffff}
  // first F0 90 80 80 last F4 8F BF BF
  //
  // Use the UTF-8 syntax from the RFC