fix typo

Author: scheinerman

test/examples.jl

@@ -18,7 +18,7 @@ end
 Sample linear program from here: https://www.youtube.com/watch?v=rzRZLGD_aeE
 """
 function example2()
-    A = [3 5 10; 5 2 8; 8 10 3]
+    A = [3 10 5; 5 2 8; 8 10 3]
     b = [120; 6; 105]
     c = [3; 4; 1]
     return Tableau(A, b, c)