Recommend snprintf over bugprone _snprinf

[CaseyCarter]

_snprintf doesn't terminate the buffer when the format result is overlong, which is just asking for trouble; snprintf always terminates. We should recommend the latter to sprintf users.

[prmerger-automator]

@CaseyCarter : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 5210b63:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/c-runtime-library/reference/sprintf-sprintf-l-swprintf-swprintf-l-swprintf-l.md	✅Succeeded

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[TylerMSFT]

Thanks, Casey!

[TylerMSFT]

#sign-off