Removed repeated content from -NoNewLine

[grantcarthew]

It looks like there was a copy paste from the -Credential parameter to the -NoNewLine. I have removed the duplicate content.

[msftclas]

This seems like a small (but important) contribution, so no Contribution License Agreement is required at this point. We will now review your pull request.
Thanks,
Microsoft Pull Request Bot

[saldana]

✅ Validation status: passed

File	Status	Preview URL	Details
reference/6/Microsoft.PowerShell.Management/Add-Content.md	✅Succeeded

For more details, please refer to the build report.

Note: If you changed an existing file name or deleted a file, broken links in other files to the deleted or renamed file are listed only in the full build report.

[juanpablojofre]

Thanks Grant !! @grantcarthew