rename section to area

seedlet-blocks/experimental-theme.json

@@ -1,10 +1,10 @@
 {
 	"templateParts": {
 		"header": {
-			"section": "header"
+			"area": "header"
 		},
 		"footer": {
-			"section": "footer"
+			"area": "footer"
 		}
 	},
 	"global": {