fix: use canonical .INPUTS/.OUTPUTS format in scaffold function

Per about_Comment_Based_Help and the PS engine source (HelpCommentsParser.cs):
- .INPUTS documents pipeline input only; canonical no-pipeline text is
  'None. You can't pipe objects to CommandName.'
- .OUTPUTS must use the fully-qualified .NET type name (System.String),
  not the PowerShell type accelerator ([string])

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: MariusStorhaug

src/functions/public/Get-PSModuleTest.ps1

@@ -13,10 +13,10 @@ function Get-PSModuleTest {
         Hello, World!
 
         .INPUTS
-        None. This function does not accept pipeline input.
+        None. You can't pipe objects to Get-PSModuleTest.
 
         .OUTPUTS
-        [string] A greeting string.
+        System.String. A greeting string for the given name.
     #>
     [OutputType([string])]
     [CmdletBinding()]