servo: Merge #18924 - Fix commonmark Markdown warnings in docs, part 1 (from mbrubeck:doc); r=Manishearth

Fixes warnings from rust-lang/rust#44229 when `--enable-commonmark` is passed to rustdoc.

This is mostly a global find-and-replace for bare URIs on lines by themselves in doc comments.

---

- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes do not require tests because they are doc formatting changes only

Source-Repo: https://github.com/servo/servo
Source-Revision: 0e62a5829b7c29ae2667a21a439aff1e89201bf3

UltraBlame original commit: 27bc43d5d11ced40c6014d9055825993935d185e

Author: marco-c

servo/components/script/dom/document.rs

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servo/components/script/dom/element.rs

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servo/components/script/dom/htmlanchorelement.rs

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servo/components/script/dom/htmlinputelement.rs

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servo/components/script/dom/htmllinkelement.rs

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servo/components/selectors/parser.rs

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servo/components/style/counter_style/mod.rs

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