std/regex/package.d: Minor adjustments.

[DoctorNoobingstoneIPresume]

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Thank you for considering this (I hope). Happy Holidays !! (-:

[dlang-bot]

Thanks for your pull request and interest in making D better, @DoctorNoobingstoneIPresume! We are looking forward to reviewing it, and you should be hearing from a maintainer soon. Please verify that your PR follows this checklist:

• My PR is fully covered with tests (you can see the coverage diff by visiting the details link of the codecov check)
• My PR is as minimal as possible (smaller, focused PRs are easier to review than big ones)
• I have provided a detailed rationale explaining my changes
• New or modified functions have Ddoc comments (with Params: and Returns:)

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Testing this PR locally

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[RazvanN7]

@DoctorNoobingstoneIPresume What is the status of this PR?

[DoctorNoobingstoneIPresume]

I apologize for long delays. I plan to work on this next week. I hope that is alright. (I have just converted the pull request to a draft. I should have done so last week.)