updated example description

examples/programs/vstte12_two_way_sort.mlw

 
-(* The 2nd Verified Software Competition (VSTTE 2012) 
+(* The 2nd Verified Software Competition (VSTTE 2012)
    https://sites.google.com/site/vstte2012/compet
 
    Problem 1:
-   Sorting an array which contains only zeros and ones, using swaps only *)
+   Sorting an array of Boolean values, using swaps only *)
 
 module TwoWaySort