Update New-MailUser.md

[anorwood-xten]

Updated example 1 so that the -MicrosoftOnlineServicesID value reflected adding the user to the contoso.com organisation

[opbld33]

Docs Build status updates of commit e4043e0:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/New-MailUser.md	✅Succeeded	View (exchange-ps)

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[opbld30]

Docs Build status updates of commit 3c13425:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/New-MailUser.md	✅Succeeded	View (exchange-ps)

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
• Post your question in the Docs support channel