Auto merge of #29703 - ohno418:update-url-constructor-steps, r=mrobinson

Update step numbers in URL constructor

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Two commits have been made ahead of the current implementation of
Servo's URL constructor:

- Align with a more modern IDL definition style [1]
- Add URL.canParse() [2]

Since these commits don't alter the actual behavior, this commit only
updates the step numbers and adds brief descriptions for each step.

No behavior change is expected with this commit.

[1]: https://github.com/whatwg/url/commit/ea3b75d333cbce91f73676ef2d21bcadb12b4419
[2]: https://github.com/whatwg/url/commit/ae3c28b84e3e7122c2807401c26b8a63cb2ab445

---
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [ ] These changes fix #___ (GitHub issue number if applicable)

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- [x] These changes do not require tests because no behavior has changed.

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