PEP 639: minor edits for clarity and consistency

[ichard26]

While reading the draft PEP 639, there were a few parts which read poorly and could be easily improved. There were also a few obvious typos.

The main substantive edits are:

• Removing references to the license-files.globs and license-files.paths fields that no longer exist in the current draft
• Shortening the summary of changes to the recording installed distributions specification by removing a redundant (implied) clause

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📚 Documentation preview 📚: https://pep-previews--3921.org.readthedocs.build/

[ghost]

All commit authors signed the Contributor License Agreement.

[hugovk]

cc @befeleme

[ichard26]

I don't have the interest in going through the formal process to amend a PEP so I'll close this.