examples: Fix typo in notebook output

Author: EdCaunt

examples/performance/01_gpu.ipynb

@@ -97,9 +97,7 @@
     "OK, it's time to let Devito generate code for our solver!"
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": 6,
+  { "cell_type": "code", "execution_count": 6,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -270,7 +268,7 @@
       "\n",
       "int Kernel(const float c, struct dataobj *restrict u_vec, const float dt, const float h_x, const float h_y, const int time_M, const int time_m, const int x_M, const int x_m, const int y_M, const int y_m, const int deviceid, const int devicerm, struct profiler * timers)\n",
       "{\n",
-      "  /* Begin of OpenMP setup */\n",
+      "  /* Beginning of OpenMP setup */\n",
       "  if (deviceid != -1)\n",
       "  {\n",
       "    omp_set_default_device(deviceid);\n",