Auto merge of #15511 - r3c0d3x:patch-1, r=Wafflespeanut
Auto merge of #15511 - r3c0d3x:patch-1, r=Wafflespeanut

Fix fmt::Display vs fmt::Debug URL

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Fixed a Rust documentation link in [`HACKING_QUICKSTART.md`](https://github.com/servo/servo/blob/44e808b5cfd6756a5fb44951575035bf9451932c/docs/HACKING_QUICKSTART.md)
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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.

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