Show only the first line of documentation on hover

Suggestion

Add an option, for example rust-analyzer.hover.documentation.briefOnly, to shrink the displayed documentation in the hover pop-up to just the first line.

My Expirience

Typically, most crates use doc comments to provide full-page documentation about. This includes a lot of useful information, examples, and more. However, popup windows are usually too small to display all that stuff. Therefore, I would prefer to see only the first line of the documentation when I hover over an item. All other information could be accessed from a "Open Documentation" button or smth.

State Of The Art

The rustdoc tutorial suggests writing doc comments in such a way that the first line introduces "a short explaining sentence, what it is". This information should be easily accessible when users hover over the code.

https://doc.rust-lang.org/rustdoc/how-to-write-documentation.html#documenting-components

The issue names no files or tests. Start by locating rust-analyzer's hover documentation rendering and related configuration options, then determine how the first documentation line and a way to access the full text should be represented. Done means the new option produces brief hover documentation while preserving access to the complete documentation.