CN bucket policy document that is no longer needed can be removed, (#10310)

which is consistent with the English document.

docs/zh_CN/bucket/policy/README.md

@@ -1,39 +0,0 @@
-## 访问策略
-
-该包实现基于访问策略语言规范（Access Policy Language specification）的解析和验证存储桶访问策略 - http://docs.aws.amazon.com/AmazonS3/latest/dev/access-policy-language-overview.html
-
-### 支持以下效果
-
-    Allow
-    Deny
-
-### 支持以下操作
-
-    s3:GetObject
-    s3:ListBucket
-    s3:PutObject
-    s3:GetBucketLocation
-    s3:DeleteObject
-    s3:AbortMultipartUpload
-    s3:ListBucketMultipartUploads
-    s3:ListMultipartUploadParts
-
-### 支持下列条件
-
-    StringEquals
-    StringNotEquals
-    StringLike
-    StringNotLike
-    IpAddress
-    NotIpAddress
-
-每个条件支持的key
-
-    s3:prefix
-    s3:max-keys
-    aws:Referer
-    aws:SourceIp
-
-### 是否支持嵌套策略
-
-不支持嵌套策略