Make into an advanced function.

ZertoApiWrapper/Public/Get-ZALicense.ps1

@@ -1,4 +1,7 @@
+<# .ExternalHelp ./en-us/ZertoApiWrapper-help.xml #>
 function Get-ZALicense {
+    [cmdletbinding()]
+    param()
     $uri = "licenses"
     Invoke-ZARestRequest -uri $uri
 }