Rustdoc does not add tooltips for reference links

[jyn514]

In general, links generated by rustdoc do have a tooltip.

E.g. something like

/// Talking about [`Result`][std::fmt::Result] here!
pub mod m {}

will come with a tooltip

Whereas (unfortunately) the following alternative

/// Talking about [`Result`] here!
/// 
/// [`Result`]: std::fmt::Result
pub mod m {}

creates almost the same documentation, just lacking the tooltip.

Originally posted by @steffahn in #88343 (comment)

[GuillaumeGomez]

I'll fix it tomorrow.

[GuillaumeGomez]

So, I think here that this is a markdown issue rather than a rustdoc issue. For example, there isn't a title there either:

/// [`Result`](std::result::Result)

Do you want us to add the title if there isn't one which will be the path to the type?

[camelid]

Hmm, but shouldn't inline links and link definitions be treated the same by rustdoc?

[GuillaumeGomez]

That's a different question. I think it would be a nice add though.

[GuillaumeGomez]

It was fixed in #108025.