xSQLServerSetup: PSScriptAnalyzer errors need to be fixed

[johlju]

Details of the scenario you tried and the problem that is occurring:
The following PSScriptAnalyzer errors need to be fixed:
MSFT_xSQLServerSetup.psm1 (Line 1808): Mandatory parameters must use the correct format [Parameter(Mandatory = $true)] for the mandatory attribute. See https://github.com/PowerShell/DscResources/blob/master/StyleGuidelines.md#correct-format-for-parameter-block
MSFT_xSQLServerSetup.psm1 (Line 1828): Mandatory parameters must use the correct format [Parameter(Mandatory = $true)] for the mandatory attribute. See https://github.com/PowerShell/DscResources/blob/master/StyleGuidelines.md#correct-format-for-parameter-block

The DSC configuration that is using the resource (as detailed as possible):
n/a

Version of the Operating System, SQL Server and PowerShell the DSC Target Node is running:
n/a

What module (SqlServer or SQLPS) and which version of the module the DSC Target Node is running:
n/a

Version of the DSC module you're using, or 'dev' if you're using current dev branch:
Dev