Normative: Fix typo in ToTemporalMonthDay

[Aditi-1400]

Fixes: #2457

[codecov]

Codecov Report

Merging #2460 (509102b) into main (86d42de) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2460   +/-   ##
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  Coverage   96.16%   96.16%           
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  Files          20       20           
  Lines       11285    11285           
  Branches     2163     2163           
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  Hits        10852    10852           
  Misses        369      369           
  Partials       64       64           

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[ptomato]

👍

I'll mark this as draft until presented at TC39.

The reference code already works this way, but we should make sure this is covered by test262 tests as well.

[ptomato]

This normative change reached consensus in the March 2023 TC39 meeting. Test262 tests are in tc39/test262#3818