Editorial: Fix various issues

[Ms2ger]

Mostly from #1424.

[codecov]

Codecov Report

Merging #1560 (33a91fe) into main (c2a7229) will decrease coverage by 3.26%.
The diff coverage is 100.00%.

❗ Current head 33a91fe differs from pull request most recent head a647903. Consider uploading reports for the commit a647903 to get more accurate results

@@            Coverage Diff             @@
##             main    #1560      +/-   ##
==========================================
- Coverage   95.58%   92.31%   -3.27%     
==========================================
  Files          19       17       -2     
  Lines       10933    10924       -9     
  Branches     1715     1616      -99     
==========================================
- Hits        10450    10085     -365     
- Misses        472      824     +352     
- Partials       11       15       +4     

Flag	Coverage Δ
test262	?
tests	91.38% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
polyfill/lib/plaindatetime.mjs	90.95% <100.00%> (-6.52%)	⬇️
polyfill/lib/plaintime.mjs	91.73% <100.00%> (-4.73%)	⬇️
polyfill/lib/plaindate.mjs	84.94% <0.00%> (-10.59%)	⬇️
polyfill/lib/plainmonthday.mjs	83.56% <0.00%> (-9.59%)	⬇️
polyfill/lib/timezone.mjs	86.27% <0.00%> (-7.19%)	⬇️
polyfill/lib/instant.mjs	87.50% <0.00%> (-7.10%)	⬇️
polyfill/lib/zoneddatetime.mjs	91.75% <0.00%> (-6.89%)	⬇️
polyfill/lib/plainyearmonth.mjs	89.77% <0.00%> (-6.63%)	⬇️
... and 7 more

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[ptomato]

No major comments, feel free to merge after addressing the nitpicks