removing duplicated legacy license, the actual instance is in 'opencv/LICENSE'

(cherry picked from commit dca56841)

doc/license.txt

-IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
-
- By downloading, copying, installing or using the software you agree to this license.
- If you do not agree to this license, do not download, install,
- copy or use the software.
-
-
-                          License Agreement
-               For Open Source Computer Vision Library
-
-Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
-Copyright (C) 2008-2011, Willow Garage Inc., all rights reserved.
-Third party copyrights are property of their respective owners.
-
-Redistribution and use in source and binary forms, with or without modification,
-are permitted provided that the following conditions are met:
-
-  * Redistributions of source code must retain the above copyright notice,
-    this list of conditions and the following disclaimer.
-
-  * Redistributions in binary form must reproduce the above copyright notice,
-    this list of conditions and the following disclaimer in the documentation
-    and/or other materials provided with the distribution.
-
-  * The name of the copyright holders may not be used to endorse or promote products
-    derived from this software without specific prior written permission.
-
-This software is provided by the copyright holders and contributors "as is" and
-any express or implied warranties, including, but not limited to, the implied
-warranties of merchantability and fitness for a particular purpose are disclaimed.
-In no event shall the Intel Corporation or contributors be liable for any direct,
-indirect, incidental, special, exemplary, or consequential damages
-(including, but not limited to, procurement of substitute goods or services;
-loss of use, data, or profits; or business interruption) however caused
-and on any theory of liability, whether in contract, strict liability,
-or tort (including negligence or otherwise) arising in any way out of
-the use of this software, even if advised of the possibility of such damage.

doc/tutorials/introduction/android_binary_package/O4A_SDK.rst

@@ -66,7 +66,7 @@ The structure of package contents looks as follows:
     |               |_ armeabi-v7a
     |               |_ x86
     |
-    |_ license.txt
+    |_ LICENSE
     |_ README.android
 
 * :file:`sdk` folder contains OpenCV API and libraries for Android: