Rollup merge of rust-lang#137889 - mu001999-contrib:update-doc, r=wesleywiser

update outdated doc with new example

update the illegal definition example because we can compile `struct Ref<'a, T> { x: &'a T }` ([play](https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=2eb2f8800d423c316b545c864623ae16))

Author: matthiaskrgr

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -188,10 +188,10 @@ fn check_well_formed(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Result<(), ErrorGua
 /// definition itself. For example, this definition would be illegal:
 ///
 /// ```rust
-/// struct Ref<'a, T> { x: &'a T }
+/// struct StaticRef<T> { x: &'static T }
 /// ```
 ///
-/// because the type did not declare that `T:'a`.
+/// because the type did not declare that `T: 'static`.
 ///
 /// We do this check as a pre-pass before checking fn bodies because if these constraints are
 /// not included it frequently leads to confusing errors in fn bodies. So it's better to check