Auto merge of #11329 - c-rhodes:11320, r=jdm

Report use statements that use {} with only one entry

Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data:
- [X ] `./mach build -d` does not report any errors
- [X ] `./mach test-tidy --faster` does not report any errors
- [X ] These changes fix #11320  (github issue number if applicable).

Either:
- [X] There are tests for these changes OR
- [ ] These changes do not require tests because _____

Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process.

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/11329)
<!-- Reviewable:end -->

components/script/dom/document.rs

@@ -100,7 +100,7 @@ use net_traits::CookieSource::NonHTTP;
 use net_traits::CoreResourceMsg::{GetCookiesForUrl, SetCookiesForUrl};
 use net_traits::response::HttpsState;
 use net_traits::{AsyncResponseTarget, PendingAsyncLoad, IpcSend};
-use num_traits::{ToPrimitive};
+use num_traits::ToPrimitive;
 use origin::Origin;
 use parse::{ParserRoot, ParserRef, MutNullableParserField};
 use script_thread::{MainThreadScriptMsg, Runnable};