update links and tracking issue for doc_spotlight

Author: QuietMisdreavus

src/doc/unstable-book/src/language-features/doc-spotlight.md

@@ -1,6 +1,6 @@
 # `doc_spotlight`
 
-The tracking issue for this feature is: [TODO]
+The tracking issue for this feature is: [#45040]
 
 The `doc_spotlight` feature allows the use of the `spotlight` parameter to the `#[doc]` attribute,
 to "spotlight" a specific trait on the return values of functions. Adding a `#[doc(spotlight)]`
@@ -24,4 +24,7 @@ impl MyTrait for MyStruct {}
 pub fn my_fn() -> MyStruct { MyStruct }
 ```
 
-This feature was originally implemented in PR [TODO].
+This feature was originally implemented in PR [#45039].
+
+[#45040]: https://github.com/rust-lang/rust/issues/45040
+[#45039]: https://github.com/rust-lang/rust/pull/45039

src/libsyntax/feature_gate.rs

@@ -382,7 +382,7 @@ declare_features! (
     // #[doc(masked)]
     (active, doc_masked, "1.21.0", Some(44027)),
     // #[doc(spotlight)]
-    (active, doc_spotlight, "1.22.0", None),
+    (active, doc_spotlight, "1.22.0", Some(45040)),
 
     // allow `#[must_use]` on functions and comparison operators (RFC 1940)
     (active, fn_must_use, "1.21.0", Some(43302)),