change package name & format document

Signed-off-by: Shawn Chen <chen8132@gmail.com>

docs/configuration.md

@@ -719,12 +719,12 @@ Then value of ipfilteredby:
 `alicdn` storage middleware allows the registry to serve layers via a content delivery network provided by Alibaba Cloud. Alicdn requires the OSS storage driver.
-| Parameter | Required | Description                                           |
-|-----------|----------|-------------------------------------------------------|
-| `baseurl` | yes      | The `SCHEME://HOST` at which Alicdn is served. |
-| `authtype` | yes   | The URL authentication type for Alicdn, which should be `a`, `b` or `c`.     |
-| `privatekey` | yes   | The URL authentication key for Alicdn.     |
-| `duration` | no      | An integer and unit for the duration of the Alicdn session. Valid time units are `ns`, `us` (or `µs`), `ms`, `s`, `m`, or `h`.|
+| Parameter    | Required | Description                                                             |
+|--------------|----------|-------------------------------------------------------------------------|
+| `baseurl`    | yes      | The `SCHEME://HOST` at which Alicdn is served.                          |
+| `authtype`   | yes      | The URL authentication type for Alicdn, which should be `a`, `b` or `c`. See the [Authentication configuration](https://www.alibabacloud.com/help/doc-detail/85117.htm).|
+| `privatekey` | yes      | The URL authentication key for Alicdn.                                  |
+| `duration`   | no       | An integer and unit for the duration of the Alicdn session. Valid time units are `ns`, `us` (or `µs`), `ms`, `s`, `m`, or `h`.|
 ### `redirect`

registry/storage/driver/middleware/alicdn/middleware.go

-package middleware
+package alicdn
 import (
 	"context"
@@ -27,7 +27,7 @@ type aliCDNStorageMiddleware struct {
 var _ storagedriver.StorageDriver = &aliCDNStorageMiddleware{}
 // newAliCDNStorageMiddleware constructs and returns a new AliCDN
-// layerHandler implementation.
+// StorageDriver implementation.
 // Required options: baseurl, authtype, privatekey
 // Optional options: duration
 func newAliCDNStorageMiddleware(storageDriver storagedriver.StorageDriver, options map[string]interface{}) (storagedriver.StorageDriver, error) {