Rollup merge of #85256 - GuillaumeGomez:fix-implementors-display, r=notriddle

Rollup merge of #85256 - GuillaumeGomez:fix-implementors-display, r=notriddle

Fix display for "implementors" section

Just saw this problem when going through docs:

![Screenshot from 2021-05-13 15-20-52](https://user-images.githubusercontent.com/3050060/118131978-766fc180-b3ff-11eb-86a8-7f6d22afa675.png)

This fix puts it back to normal:

![Screenshot from 2021-05-13 15-23-29](https://user-images.githubusercontent.com/3050060/118132006-7e2f6600-b3ff-11eb-9985-025a7b7c5216.png)

You can see it on the `TryFrom` page for example.

r? ```@Nemo157```