Update README.md

README.md

@@ -122,12 +122,12 @@ Subscribe quantity and size to quantumleap
 Modify quantity
 ---------------
 
-curl -X PUT \
+`curl -X PUT \
   http://localhost:1026/v2/entities/urn:ngsi-ld:Product:001/attrs/quantity/value \
   -H 'Content-Type: text/plain' \
   -H 'fiware-path: /' \
   -H 'fiware-service: sensores' \
-  -d $1
+  -d $1`
 
 
 Modify quantity and size