Update New-AzResourceGroupDeployment.md

[omkarkhair]

Description

Fixed the documentation for deployment modes. Previously the description text wasn't aligned against the correct mode.

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]

@azuresdkci add to whitelist