LICENSES: Improve the legibility of these files

A few newlines go a very long way.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>

LICENSES/GPL-2.0

@@ -2,19 +2,25 @@ Valid-License-Identifier: GPL-2.0
 Valid-License-Identifier: GPL-2.0-only
 Valid-License-Identifier: GPL-2.0+
 Valid-License-Identifier: GPL-2.0-or-later
+
 SPDX-URL: https://spdx.org/licenses/GPL-2.0.html
+
 Usage-Guide:
+
   To use this license in source code, put one of the following SPDX
   tag/value pairs into a comment according to the placement
   guidelines in the licensing rules documentation.
+
   For 'GNU General Public License (GPL) version 2 only' use:
     SPDX-License-Identifier: GPL-2.0-only
   or (now deprecated)
     SPDX-License-Identifier: GPL-2.0
+
   For 'GNU General Public License (GPL) version 2 or any later version' use:
     SPDX-License-Identifier: GPL-2.0+
   or
     SPDX-License-Identifier: GPL-2.0-or-later
+
 License-Text:
 
 		    GNU GENERAL PUBLIC LICENSE