erp5: Clarify software types descriptions.

software/erp5/software.cfg.json

@@ -5,14 +5,14 @@
   "software-type": {
     "default": {
       "title": "Default",
-      "description": "Default deployment of ERP5 with auto-create instance.",
+      "description": "No automated database modification (ERP5Site is not automatically created).",
       "request": "instance-erp5-input-schema.json",
       "response": "instance-erp5-output-schema.json",
       "index": 0
     },
     "create-erp5-site": {
       "title": "Create ERP5 Site", 
-      "description": "Default deployment of ERP5 with automatic creation of the instance.",
+      "description": "Automated ERP5Site creation on instanciation when ZODB is found empty.",
       "request": "instance-erp5-input-schema.json",
       "response": "instance-erp5-output-schema.json",
       "index": 1