Remove unnecessary comments.

cors.go

@@ -13,8 +13,6 @@ type Config struct {
 	AllowAllOrigins bool
 
 	// AllowedOrigins is a list of origins a cross-domain request can be executed from.
-	// If the special "*" value is present in the list, all origins will be allowed.
-	// Default value is ["*"]
 	AllowOrigins []string
 
 	// AllowOriginFunc is a custom function to validate the origin. It take the origin
@@ -28,8 +26,6 @@ type Config struct {
 
 	// AllowedHeaders is list of non simple headers the client is allowed to use with
 	// cross-domain requests.
-	// If the special "*" value is present in the list, all headers will be allowed.
-	// Default value is [] but "Origin" is always appended to the list.
 	AllowHeaders []string
 
 	// AllowCredentials indicates whether the request can include user credentials like