Update Get-MailflowStatusReport.md

[faoquong]

@chrisda we dont support hour and minute filter. only dates.

[opbld32]

Docs Build status updates of commit 50a533f:

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File	Status	Preview URL	Details
exchange/exchange-ps/exchange/Get-MailflowStatusReport.md	:white_check_mark:Succeeded	View (exchange-ps)

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