Update New-AzureRmDeployment.md

[jftl6y]

Fix typo

Description

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate change log has been updated
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • the changes have gone through a cmdlet design review (Microsoft internal partners only)
  • the cmdlet markdown files were generated using the platyPS module

[adxsdkps]

Can one of the admins verify this patch?

[cormacpayne]

@jftl6y Hey John, thanks for making this fix. All of our document changes should be in the master branch, which points to our new Az documentation. The preview branch contains the documentation for the AzureRM documentation, which we aren't updating at the moment. I went ahead and opened a new PR that makes this change for our Az documentation: #8245

Please let me know if you have any questions or concerns!