Doc: Updated GPL license terms.

Author: ebertin

doc/src/License.rst

@@ -8,15 +8,13 @@ License
 Code
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-The |SExtractor|_ code is licensed under a GPL v3 license:
+The |SExtractor|_ code is licensed under a `GPL v3 license <https://www.gnu.org/licenses/gpl.html>`_:
 
 |SExtractor| *is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.*
 
 |SExtractor| *is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 See the GNU General Public License for more details.*
 
-*You should have received a copy of the GNU General Public License along with* |SExtractor|. *If not, see* `www.gnu.org/licenses/ <http://www.gnu.org/licences/>`_.
-
 Documentation
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