Update Connect-SPOService.md

Author: dangshubham

sharepoint/sharepoint-ps/Microsoft.Online.SharePoint.PowerShell/Connect-SPOService.md

@@ -231,6 +231,11 @@ Accept pipeline input: False
 Accept wildcard characters: False
 ```
 
+Instead of adding the -UseSystemBrowser parameter every time users run Connect-SPOService, this choice can be controlled by a registry key as well. This registry key (UseSystemBrowser of type REG_DWORD) will be located at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SPO\CMDLETS).
+
+If either registry key is set to a non-zero integer value OR UseSystemBrowser parameter is set to true, authentication flow will use system browser for sign-in.
+
+
 ### CommonParameters
 
 This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable, -InformationAction, -InformationVariable, -OutVariable, -OutBuffer, -PipelineVariable, -Verbose, -WarningAction, and -WarningVariable. For more information, see [about_CommonParameters](/powershell/module/microsoft.powershell.core/about/about_commonparameters).