docs: mention calling produceBase for options to pass to producePreset

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 📝 Documentation: Mention Base Options parsing in producer and runner API docs #80
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

I don't think this needs to be a whole deep dive. Just a mention and straightforward code block.

💝

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Name	Status	Preview	Comments	Updated (UTC)
create	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 17, 2025 9:17pm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.54%. Comparing base (18a76d5) to head (2da248e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #142   +/-   ##
=======================================
  Coverage   98.54%   98.54%           
=======================================
  Files         182      182           
  Lines        6686     6686           
  Branches      976      976           
=======================================
  Hits         6589     6589           
  Misses         94       94           
  Partials        3        3           

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