Rollup merge of rust-lang#126946 - cyrgani:patch-1, r=compiler-errors

Add missing slash in `const_eval_select` doc comment

In the middle of the doc comment, one line has only two slashes instead of three and isn't included in the [rendered documentation](https://doc.rust-lang.org/std/intrinsics/fn.const_eval_select.html#stability-concerns). This PR adds the missing slash.

library/core/src/intrinsics.rs

@@ -2579,7 +2579,7 @@ extern "rust-intrinsic" {
 ///     fn runtime() -> i32 { 1 }
 ///     const fn compiletime() -> i32 { 2 }
 ///
-//      // ⚠ This code violates the required equivalence of `compiletime`
+///     // ⚠ This code violates the required equivalence of `compiletime`
 ///     // and `runtime`.
 ///     const_eval_select((), compiletime, runtime)
 /// }