Rollup merge of rust-lang#144014 - dianne:edition-guide-links, r=estebank

don't link to the nightly version of the Edition Guide in stable lints

As reported in rust-lang#143557 for `rust_2024_incompatible_pat`, most future-Edition-incompatibility lints link to the nightly version of the Edition Guide; the lints were written before their respective Editions (and their guides) stabilized. But now that Rusts 2021 and 2024 are stable, these lints are emitted on stable versions of the compiler, where it makes more sense to present users with links that don't say "nightly" in them.

This does not change the link for `rust_2024_incompatible_pat`. That's handled in rust-lang#144006.

Author: fmease

tests/ui/checked_unwrap/simple_conditionals.stderr

@@ -328,7 +328,7 @@ error: creating a shared reference to mutable static
 LL |         if X.is_some() {
    |            ^^^^^^^^^^^ shared reference to mutable static
    |
-   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/static-mut-references.html>
+   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2024/static-mut-references.html>
    = note: shared references to mutable statics are dangerous; it's undefined behavior if the static is mutated or if a mutable reference is created for it while the shared reference lives
    = note: `#[deny(static_mut_refs)]` on by default