Add comment to n-queens test (#87)

Author: odow

test/runtests.jl

@@ -1796,6 +1796,9 @@ end
 function _test_nqueens_solve_num_solutions(
     model,
     q,
+    # This value is wrong due to a bug in Chuffed@0.13.2. If it is fixed in
+    # the future, the true value should be 92.
+    # See https://github.com/jump-dev/MiniZinc.jl/issues/84 for details.
     actual_count = 52,
     termination_status = MOI.OPTIMAL,
 )