Update x64-calling-convention.md

[wesinator]

syntax highlighting example return values code

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[ShannonLeavitt]

@TylerMSFT

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[TylerMSFT]

Hi, we use output when showing the output of a running program. That's not the case here. These examples are demonstrating types/functions. cpp is the right tag here.

[TylerMSFT]

Thank you for fixing the stragglers in this file.

[TylerMSFT]

#sign-off

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[TylerMSFT]

@wesinator , love your alias tagline, by the way. Thanks for improving this topic today, one PR at a time :-)