Updated cell numbering in console example.

examples/widgets/Nonblocking Console.ipynb

@@ -24,7 +24,7 b''
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 6
+     "prompt_number": 1
     },
     {
      "cell_type": "markdown",
@@ -113,7 +113,7 b''
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 7
+     "prompt_number": 2
     },
     {
      "cell_type": "markdown",
@@ -148,7 +148,7 b''
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 8
+     "prompt_number": 3
     },
     {
      "cell_type": "markdown",
@@ -189,7 +189,7 b''
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 9
+     "prompt_number": 4
     },
     {
      "cell_type": "markdown",
@@ -218,7 +218,7 b''
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 10
+     "prompt_number": 5
     }
    ],
    "metadata": {}