fix path parameter for create method of newCMSnewPageView

Update path parameter passed to create method of newCMSnewPageView. New validator was added and path must start with '/'. Fix for test test_api_key_autocomplete

testsuite/tests/ui/oas/test_api_key_autocomplete.py

@@ -42,7 +42,7 @@ def api_doc_page(login, navigator, ui_active_doc, request, custom_admin_login):
     """Custom doc page for developer portal"""
     view = navigator.navigate(CMSNewPageView)
     page_name = blame(request, "CustomDocumentation")
-    page_path = blame(request, "apidocs")
+    page_path = f'/{blame(request, "apidocs")}'
 
     view.create(
         page_name,