Added documentation around access_logs enabled and reverted default

value to true

builtin/providers/aws/resource_aws_alb.go

@@ -91,7 +91,7 @@ func resourceAwsAlb() *schema.Resource {
 						"enabled": &schema.Schema{
 							Type:     schema.TypeBool,
 							Optional: true,
-							Default:  false,
+							Default:  true,
 						},
 					},
 				},

website/source/docs/providers/aws/r/alb.html.markdown

@@ -54,6 +54,7 @@ Access Logs (`access_logs`) support the following:
 
 * `bucket` - (Required) The S3 bucket name to store the logs in.
 * `prefix` - (Optional) The S3 bucket prefix. Logs are stored in the root if not configured.
+* `enabled` = (Optional) Boolean to enable / disable `access_logs`. Default is `true`
 
 ## Attributes Reference