Update noise_suppression.ipynb

Author: jaeyoo

Diff for: docs/tutorials/noise_suppression.ipynb

@@ -946,9 +946,9 @@
         "    discriminator_parameters = []\n",
         "    generator_parameters = []\n",
         "    for j in range(num_disc_parameters(n_qubits)):\n",
-        "        discriminator_parameters.append(sympy.Symbol('Discrimx{!r}'.format(j)))\n",
+        "        discriminator_parameters.append(sympy.Symbol('Discrimx{}'.format(j)))\n",
         "    for j in range(num_gen_parameters(n_qubits)):\n",
-        "        generator_parameters.append(sympy.Symbol('Genx{!r}'.format(j)))\n",
+        "        generator_parameters.append(sympy.Symbol('Genx{}'.format(j)))\n",
         "    target_circuits, target_real_data_circuit = generate_data(data_qubits,\n",
         "        generator_qubits, target_quantum_data, data_noise, noise_model, n_data)\n",
         "\n",
@@ -1305,4 +1305,4 @@
       ]
     }
   ]
-}
+}