Rollup merge of rust-lang#135898 - aDotInTheVoid:dyndoc, r=fmease

rustdoc-json-types: Finalize dyn compatibility renaming

Followup to rust-lang#131595.

Part of rust-lang#130852.

Inspired by rust-lang#135858 (does the same thing but for the rustdoc-types docs).

r? ```@fmease```

src/rustdoc-json-types/lib.rs

@@ -1099,8 +1099,7 @@ pub struct Trait {
     pub is_auto: bool,
     /// Whether the trait is marked as `unsafe`.
     pub is_unsafe: bool,
-    // FIXME(dyn_compat_renaming): Update the URL once the Reference is updated and hits stable.
-    /// Whether the trait is [dyn compatible](https://doc.rust-lang.org/reference/items/traits.html#object-safety)[^1].
+    /// Whether the trait is [dyn compatible](https://doc.rust-lang.org/reference/items/traits.html#dyn-compatibility)[^1].
     ///
     /// [^1]: Formerly known as "object safe".
     pub is_dyn_compatible: bool,