UX: move the `implements notable traits` message down

could we please move this notable traits section below the documentation?

this has been bugging me for the longest time because it literally comes before any documentation and forces me to scroll down on every single thing i want to look at the docs for, and I never found myself in a situation where i even use this feature, even though it shows up on basically every single function in the language because of all the silly Future<Output> whatever stuff basically everything seems to implement nowadays. it just bloats the screen for no reason. not to mention the visual presentation of the data in question is too cluttered.

Start by locating the rust-analyzer UI rendering for the “implements notable traits” section shown in the issue image. Move that section below the documentation and review the resulting presentation; done means documentation appears first without the current scrolling burden or clutter.