Make the use of Oxford commas even more consistent

[pressRtowin]

ManagedEntranceStrings.resx has a comma here for the exact same string. Just making the two consistent.

PR Summary

Added two commas

PR Context

The commas are consistent with the previous use of a comma in ManagedEntranceStrings.resx and my proposed additional comma there in #25139.

PR Checklist

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• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
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• User-facing changes
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[sdwheeler]

LGTM

[iSazonov]

/azp run

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