Fixed commented out code to current version of qiskit in case users want to run on devices rather than simulators

Author: attp

terra/qis_intro/entanglement_introduction.ipynb

@@ -100,7 +100,7 @@
     "\n",
     "# Uncomment the following lines to run on a real device\n",
     "# IBMQ.load_accounts()\n",
-    "# from qiskit.backends.ibmq import least_busy\n",
+    "# from qiskit.providers.ibmq import least_busy\n",
     "# backend = least_busy(IBMQ.backends(operational=True, simulator=False))\n",
     "# print(\"the best backend is \" + backend.name())"
    ]
@@ -714,7 +714,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.2"
+   "version": "3.7.3"
   }
  },
  "nbformat": 4,

terra/qis_intro/superposition.ipynb

@@ -100,7 +100,7 @@
     "\n",
     "# Uncomment the following lines to run on a real device\n",
     "#IBMQ.load_accounts()\n",
-    "#from qiskit.backends.ibmq import least_busy\n",
+    "#from qiskit.providers.ibmq import least_busy\n",
     "#backend = least_busy(IBMQ.backends(operational=True, simulator=False))\n",
     "#print(\"the best backend is \" + backend.name())"
    ]
@@ -652,7 +652,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.2"
+   "version": "3.7.3"
   }
  },
  "nbformat": 4,

terra/qis_intro/teleportation_superdensecoding.ipynb

@@ -677,7 +677,7 @@
     "\n",
     "# Uncomment the following lines to run on a real device\n",
     "# IBMQ.load_accounts()\n",
-    "# from qiskit.backends.ibmq import least_busy\n",
+    "# from qiskit.providers.ibmq import least_busy\n",
     "# backend = least_busy(IBMQ.backends(operational=True, simulator=False))\n",
     "# print(\"the best backend is \" + backend.name())\n",
     "\n",
@@ -722,7 +722,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.2"
+   "version": "3.7.3"
   }
  },
  "nbformat": 4,