rustdoc cannot resolve private intra-rustdoc link

[dragostis]

When in a private mod, rustdoc fails to resolve a private member when called with --document-private-items.

A project like this...
src/lib.rs:

mod foo;

src/foo.rs:

//! [`Bar`]
struct Bar;

... results in:

warning: `[Bar]` cannot be resolved, ignoring it...
 --> src/foo.rs:1:6
  |
1 | //! [`Bar`]
  |      ^^^^^ cannot be resolved, ignoring
  |
  = note: `#[warn(intra_doc_link_resolution_failure)]` on by default
  = help: to escape `[` and `]` characters, just add '\' before them like `\[` or `\]`

[jyn514]

The culprit is here:

rust/src/librustdoc/html/format.rs

Line 471 in ea7181b

if !did.is_local() && !cache.access_levels.is_public(did) {

We should check there if --document-private-items was passed, and if so, don't skip the item.

[jyn514]

Fixed in #72771