Rustdoc currently does not distinguish between public and private items

[pvshvp-oss]

Rustdoc currently does not label, mark, or otherwise separate private items to distinguish them from public items, when the --document-private-items command-line argument is passed. The generated documentation hence can be confusing to the reader. I suggest enabling one or more of the below through rustdoc:

1. Separate public and private items in the generated documentation
2. Enable toggling the visibility of private items in the generated documentation.
3. Label or mark private items to clearly distinguish them from public items.

This issue was prompted by rust-lang/docs.rs#304 (comment)

[jyn514]

@shivanandvp so, I spoke a little too quickly before, rustdoc does in fact distinguish items with different visibility, you just have to click through to the item itself instead of the module where it's listed:

[koehlma]

How about adding some transparency to the item names or would that be too subtle?

I think I would be able to contribute a PR making this happen.

[GuillaumeGomez]

Fixed by #95024.