rustc_trait: Code snippet ignore problem

[pierwill]

When running cargo doc in compiler/rustc_passes/, I got the following:

warning: could not parse code block as Rust code
  --> compiler/rustc_trait_selection/src/opaque_types.rs:45:9
   |
45 |       /// ```ignore (incomplete snippet)
   |  _________^
46 | |     /// type Foo = impl Baz;
47 | |     /// fn bar() -> Foo {
48 | |     /// //          ^^^ This is the span we are looking for!
49 | |     /// ```
   | |___________^
   |
   = note: error from rustc: this file contains an unclosed delimiter

The code is here:

rust/compiler/rustc_trait_selection/src/opaque_types.rs

Lines 45 to 49 in bb17823

	/// ```ignore (incomplete snippet)
	/// type Foo = impl Baz;
	/// fn bar() -> Foo {
	/// // ^^^ This is the span we are looking for!
	/// ```

[jyn514]

@pierwill this particular one should be fixed by #79816.