You are only likely to be sued if you are using it in a way to cause confusion with the brand itself. Like selling product as official merch or trying to make money off being associated with rust.
The document goes to great pains to express all the ways you can still use it.
Tl;dr: this is very boilerplate and similar to many other open source projects. If you’re not trying to capitalize off the brand, then don’t worry about it