Update solidity-by-example.rst

Might be trivial, but makes more sense to be able to directly return the name of the winner for the election. If the position of the winner on the proposal[] array is returned, then people still don't know the name of the person who won.

docs/solidity-by-example.rst

@@ -170,6 +170,22 @@ of votes.
                 }
             }
         }
+        
+        function winnerName() constant
+                returns (bytes32 winnerName)
+        {
+            //Init a for loop that compares all the votes
+            //one at a time. If a higher count is found, the
+            //value is updated. p represents position of the
+            //proposed person's name in the array
+            uint winningVoteCount = 0;
+            for (uint p = 0; p < proposals.length; p++) {
+                if (proposals[p].voteCount > winningVoteCount) {
+                    winningVoteCount = proposals[p].voteCount;
+                    winnerName = proposals[p].name;
+                }
+            }
+        }
     }
 
 Possible Improvements