<!-- Please describe your changes on the following line: -->
Fixed a Rust documentation link in [`HACKING_QUICKSTART.md`](44e808b5cf/docs/HACKING_QUICKSTART.md)
---
The link to Rust's documentation comparing `fmt::Display` and `fmt::Debug` no longer points to the right section of the page.
- [x] These changes do not require tests because it's simply changing a URL in the documentation.
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
Source-Repo: https://github.com/servo/servo
Source-Revision: eca8c4ed7384e98efcb15b8ef603f27650126fd5
--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 9451958c39f58bfc06666554d45dda1fa6b7d381
4609f2c8a8