Fix doc comment on attribute (#90)

cors.go

@@ -41,7 +41,7 @@ type Options struct {
 	// as argument and returns true if allowed or false otherwise. If this option is
 	// set, the content of AllowedOrigins is ignored.
 	AllowOriginFunc func(origin string) bool
-	// AllowOriginFunc is a custom function to validate the origin. It takes the HTTP Request object and the origin as
+	// AllowOriginRequestFunc is a custom function to validate the origin. It takes the HTTP Request object and the origin as
 	// argument and returns true if allowed or false otherwise. If this option is set, the content of `AllowedOrigins`
 	// and `AllowOriginFunc` is ignored.
 	AllowOriginRequestFunc func(r *http.Request, origin string) bool