Rollup merge of #78114 - jyn514:private, r=oli-obk

Recognize `private_intra_doc_links` as a lint

Previously, trying to allow this would give another error!

```
warning: unknown lint: `private_intra_doc_links`
 --> private.rs:1:10
  |
1 | #![allow(private_intra_doc_links)]
  |          ^^^^^^^^^^^^^^^^^^^^^^^ help: did you mean: `broken_intra_doc_links`
  |
  = note: `#[warn(unknown_lints)]` on by default

warning: public documentation for `DocMe` links to private item `DontDocMe`
 --> private.rs:2:11
  |
2 | /// docs [DontDocMe]
  |           ^^^^^^^^^ this item is private
  |
  = note: `#[warn(private_intra_doc_links)]` on by default
  = note: this link will resolve properly if you pass `--document-private-items`
```

Fixes the issue found in https://github.com/rust-lang/rust/pull/77249#issuecomment-712339227.

r? ````````@Manishearth````````

Does anyone know why this additional step is necessary? It seems weird this has to be declared in 3 different places.

0 files changed, 0 insertions, 0 deletions