Triton_GPT2 example: extend the example notebook

fix Typo

examples/triton_gpt2/README.ipynb

@@ -259,7 +259,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 1,
    "id": "married-roller",
    "metadata": {},
    "outputs": [
@@ -291,15 +291,15 @@
       "\r\n",
       "< content-type: application/json\r",
       "\r\n",
-      "< seldon-puid: 150b15aa-fc9d-416b-a934-b683965d551f\r",
+      "< seldon-puid: 97dd6a08-3520-48f2-af34-7c32e5967c38\r",
       "\r\n",
       "< x-content-type-options: nosniff\r",
       "\r\n",
-      "< date: Mon, 17 May 2021 16:21:31 GMT\r",
+      "< date: Fri, 21 May 2021 14:26:22 GMT\r",
       "\r\n",
       "< content-length: 336\r",
       "\r\n",
-      "< x-envoy-upstream-service-time: 4\r",
+      "< x-envoy-upstream-service-time: 3\r",
       "\r\n",
       "< server: istio-envoy\r",
       "\r\n",
@@ -324,10 +324,19 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": 2,
    "id": "modified-termination",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Input: I enjoy working in Seldon\n",
+      "Output: I enjoy working in Seldon 's office , and I 'm glad to see that\n"
+     ]
+    }
+   ],
    "source": [
     "import requests\n",
     "import json\n",