Rollup merge of #135998 - GuillaumeGomez:fix-trait-items-mobile-indent, r=notriddle

[rustdoc] Fix indent of trait items on mobile

Before:

![Screenshot From 2025-01-24 15-38-53](https://github.com/user-attachments/assets/f7738ff8-92b6-4aca-8a66-2d3618c54572)

After:

![Screenshot From 2025-01-24 15-38-37](https://github.com/user-attachments/assets/0a19dc7e-dddd-4cd5-b087-1915e152d7c1)

Seems like we forgot them when we did #131718. Can be tested [here](https://rustdoc.crud.net/imperio/fix-trait-items-mobile-indent/foo/trait.T.html).

r? `@notriddle`