remove docs from whitelist

docs/Dockerfile

@@ -1,3 +1,23 @@
+# -*- mode: dockerfile -*-
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+#
 FROM ubuntu:14.04
 MAINTAINER Mu Li <[email protected]>
 

tests/nightly/apache_rat_license_check/rat-excludes

@@ -14,7 +14,6 @@ trunk/*
 .*svg
 .*cfg
 .*config
-docs/*
 __init__.py
 build/*
 .*\\.t