Auto merge of #371 - nical:doc-fix, r=kvark
Auto merge of #371 - nical:doc-fix, r=kvark

Fix doc about default aliases.

Fixes #370.

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/euclid/371)
<!-- Reviewable:end -->

servo/rust-geom