Fix code scanning warning

Author: reshmabidikar

userguide/aviate/aviate-tax.adoc

@@ -132,7 +132,8 @@ In brief, you would need to do the following:
 +
 3. Create a billing account corresponding to the account. You can use the following API call. Ensure that the billing account includes tax registrations with the appropriate country code in the address.
 +
-```
+[source, bash]
+----
 curl -X POST \
   -H "Content-Type: application/json" \
   -H "X-killbill-apiKey: aviate" \
@@ -156,7 +157,7 @@ curl -X POST \
     ]
   }' \
   http://127.0.0.1:8080/plugins/aviate-plugin/v1/ba
-```
+----
 +
 4. Create a subscription corresponding to a product configured in Step 1. You can use https://apidocs.killbill.io/subscription#create-a-subscription[API] or https://docs.killbill.io/latest/userguide_kaui#_add_a_subscription[kaui]. The tax invoice item will automatically be generated.