Update documentation for *-AzureRmNetworkInterface cmdlets

[johnmic]

No description provided.

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[azuresdkci]

Can one of the admins verify this patch?

[markcowl]

@DeepakRajendranMsft can you take a look?

[markcowl]

@azuresdkci add to whitelist

[DeepakRajendranMsft]

@markcowl LGTM