refactor: update confusing label

erpnext/stock/doctype/item/item.json

@@ -1059,7 +1059,7 @@
   {
    "fieldname": "website_image_alt",
    "fieldtype": "Data",
-   "label": "Image Alt Text"
+   "label": "Image Description"
   }
  ],
  "has_web_view": 1,
@@ -1131,4 +1131,4 @@
  "sort_order": "DESC",
  "title_field": "item_name",
  "track_changes": 1
-}
+}