Tweak comments to satisfy golint

middlewares/logger.go

@@ -19,7 +19,7 @@ const (
 )
 
 /*
-Middleware Logger writes each request and its response to the access log.
+Logger writes each request and its response to the access log.
 It gets some information from the logInfoResponseWriter set up by previous middleware.
 */
 type Logger struct {

middlewares/saveBackend.go

@@ -4,7 +4,7 @@ import (
 	"net/http"
 )
 
-// Middleware saveBackend sends the backend name to the logger.
+// SaveBackend sends the backend name to the logger.
 type SaveBackend struct {
 	next http.Handler
 }