Remove DST notes from gmtime docs

[TartanLlama]

Remove note about daylight savings time, as these functions convert from time-since-epoch to UTC, neither of which are affected by daylight savings
Fixes #3443

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Learn Build status updates of commit faf183f:

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docs/c-runtime-library/reference/gmtime-gmtime32-gmtime64.md	✅Succeeded
docs/c-runtime-library/reference/gmtime-s-gmtime32-s-gmtime64-s.md	✅Succeeded

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[Jak-MS]

@TylerMSFT

• Can you review this PR?
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#label:"aq-pr-triaged"
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[TylerMSFT]

Thank you, Sy!

[learn-build-service-prod]

Learn Build status updates of commit 517b027:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/c-runtime-library/reference/gmtime-gmtime32-gmtime64.md	✅Succeeded
docs/c-runtime-library/reference/gmtime-s-gmtime32-s-gmtime64-s.md	✅Succeeded

For more details, please refer to the build report.

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[TylerMSFT]

#sign-off