Update CMakeLists.txt (#472)

doc/CMakeLists.txt

-# Copyright 2017 Nervana Systems Inc.
+#*******************************************************************************
+# Copyright 2017-2018 Intel Corporation
+#
 # Licensed 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
@@ -10,6 +12,7 @@
 # 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.
+#*******************************************************************************
  
 if ("${NGRAPH_BUILD_DOCS}" MATCHES "^ON$")
     add_custom_target( docs