Update variables.tf (terraform-aws-modules#113)

Well the http listener should be described as such I think =)

Author: tomasbackman

variables.tf

@@ -47,7 +47,7 @@ variable "https_listeners_count" {
 }
 
 variable "http_tcp_listeners" {
- description = "A list of maps describing the HTTPS listeners for this ALB. Required key/values: port, protocol. Optional key/values: target_group_index (defaults to 0)"
+ description = "A list of maps describing the HTTP listeners for this ALB. Required key/values: port, protocol. Optional key/values: target_group_index (defaults to 0)"
  type = list(map(string))
  default = []
 }