Update example formatting in Get-PSModuleTest documentation (#10)

Author: MariusStorhaug

src/functions/public/Get-PSModuleTest.ps1

@@ -7,7 +7,9 @@
         Performs tests on a module.
 
         .EXAMPLE
+        ```pwsh
         Test-PSModule -Name 'World'
+        ```
 
         "Hello, World!"
     #>