Fix tests

- Add test for unresolved `Self`
- Fix ignore syntax

src/test/rustdoc-ui/intra-link-errors.rs

@@ -99,6 +99,10 @@ pub trait T {
 //~^ ERROR unresolved link
 //~| HELP to link to the macro
 //~| NOTE not in the value namespace
+/// [Self]
+//~^ ERROR unresolved link
+//~| no item named `Self` in scope
+//~| HELP to escape
 #[macro_export]
 macro_rules! m {
     () => {};

src/test/rustdoc-ui/intra-link-errors.stderr

@@ -139,5 +139,13 @@ LL | /// [m()]
    |      this link resolves to the macro `m`, which is not in the value namespace
    |      help: to link to the macro, add an exclamation mark: `m!`
 
-error: aborting due to 20 previous errors
+error: unresolved link to `Self`
+  --> $DIR/intra-link-errors.rs:102:6
+   |
+LL | /// [Self]
+   |      ^^^^ no item named `Self` in scope
+   |
+   = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
+
+error: aborting due to 21 previous errors
 

src/test/rustdoc/intra-link-prim-self.rs

@@ -1,4 +1,4 @@
-// ignore (#75809)
+// ignore-test (#75809)
 // ignore-tidy-linelength
 #![deny(broken_intra_doc_links)]
 #![feature(lang_items)]