F OpenNebula#3440: Fix typo on error message

src/vmm_mad/remotes/lib/nsx_driver/dfw_nsxt.rb

@@ -159,7 +159,7 @@ def delete_rule(rule_id, section_id = @one_section_id)
             # Delete receive a 200 OK also if the rule doesn't exist
             @nsx_client.delete(url, HEADER_JSON)
             result = rules_by_id(rule_id)
-            raise 'Error deleting section in DFW' if result
+            raise 'Error deleting rule in DFW' if result
         end
 
     end