docs: modernize code examples

[Copilot]

Description written manually by @mark-wiemer:

PR Checklist

• Addresses an existing open issue: works on 📝 Docs: Review docs for correctness #5528
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Various minor improvements to make our code samples more modern :)

[linux-foundation-easycla]

• ✅ login: mark-wiemer / name: Mark Wiemer (3993365)
• ❌ - login: @Copilot / name: copilot-swe-agent[bot] . The commit (03a7e9c, 2dd909d, 44a4617, 7b95659, f0a1e39) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

[mark-wiemer]

changes looking good so far :)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.40%. Comparing base (bbd0ace) to head (2dd909d).
⚠️ Report is 64 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5687   +/-   ##
=======================================
  Coverage   88.40%   88.40%           
=======================================
  Files          66       66           
  Lines        4794     4794           
  Branches      978      978           
=======================================
  Hits         4238     4238           
  Misses        556      556           

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[mark-wiemer]

Will merge in 7 days unless someone stops me :)

[JoshuaKGoldberg]

Those merges look scary 😄 but yes please!

[mark-wiemer]

Someone stopped me... myself and my forgetfulness! Resolved merge conflicts, merging...