TensorBoard fix in tutorial.ipynb (#9064)

tutorial.ipynb

@@ -660,7 +660,7 @@
         "#@title Select YOLOv5 🚀 logger\n",
         "logger = 'TensorBoard' #@param ['TensorBoard', 'ClearML', 'W&B']\n",
         "\n",
-        "if logger == 'Tensorboard':\n",
+        "if logger == 'TensorBoard':\n",
         "  %load_ext tensorboard\n",
         "  %tensorboard --logdir runs/train\n",
         "elif logger == 'ClearML':\n",
@@ -1103,4 +1103,4 @@
       "outputs": []
     }
   ]
-}
+}
\ No newline at end of file