Big trailing whitespace cleanup part 2

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

src/pawns.h

@@ -7,12 +7,12 @@
   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.
-  
+
   Stockfish 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
@@ -32,7 +32,7 @@
 //// Types
 ////
 
-/// PawnInfo is a class which contains various information about a pawn 
+/// PawnInfo is a class which contains various information about a pawn
 /// structure.  Currently, it only includes a middle game and an end game
 /// pawn structure evaluation, and a bitboard of passed pawns.  We may want
 /// to add further information in the future.  A lookup to the pawn hash table