Tweak help formatting script to be more StrictMode tolerant (#10563)

src/System.Management.Automation/FormatAndOutput/DefaultFormatters/HelpV3_format_ps1xml.cs

@@ -139,7 +139,8 @@ if (($_.relatedLinks -ne $()) -and ($_.relatedLinks.navigationLink -ne $()) -and
             var MamlParameterControl = CustomControl.Create()
                     .StartEntry()
                         .AddScriptBlockExpressionBinding(
-@"$optional = $_.required -ne 'true'
+@"Set-StrictMode -Off
+$optional = $_.required -ne 'true'
 $positional = (($_.position -ne $()) -and ($_.position -ne '') -and ($_.position -notmatch 'named') -and ([int]$_.position -ne $()))
 $parameterValue = if ($null -ne $_.psobject.Members['ParameterValueGroup']) {
     "" {$($_.ParameterValueGroup.ParameterValue -join ' | ')}""