Try to clarify Calendar#fields documentation.

[Ms2ger]

Fixes #1425.

[codecov]

Codecov Report

Merging #1580 (c300360) into main (0e24fd3) will decrease coverage by 3.26%.
The diff coverage is n/a.

❗ Current head c300360 differs from pull request most recent head a80b0ee. Consider uploading reports for the commit a80b0ee to get more accurate results

@@            Coverage Diff             @@
##             main    #1580      +/-   ##
==========================================
- 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% <ø> (ø)

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

Impacted Files	Coverage Δ
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%)	⬇️
polyfill/lib/plaindatetime.mjs	90.95% <0.00%> (-6.52%)	⬇️
polyfill/lib/plaintime.mjs	91.73% <0.00%> (-4.73%)	⬇️
polyfill/lib/duration.mjs	94.10% <0.00%> (-4.11%)	⬇️
polyfill/lib/calendar.mjs	91.36% <0.00%> (-2.98%)	⬇️
... and 5 more

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[ptomato]

You're right, that was out of date.