Added note about auto TensorBoard in Lesson 28 part 2 demo

Author: gperdrizet

notebooks/unit4/lesson_28/Lesson_28_demo_part2.ipynb

@@ -199,12 +199,12 @@
     "tensorboard --logdir=path/to/log_dir/from/notebook_dir\n",
     "```\n",
     "\n",
-    "Then visit the URL provided in your browser or via the 'ports' tab in VS Code."
+    "Then visit the URL provided in your browser or via the 'ports' tab in VS Code. **Note**: if you are using the course tensorflow-GPU devcontainer environment, you do not need to start TensorBoard manually - it will start when you spin up the container. You can access it at `localhost:6006` or via the command pallette under `Python: Launch TensorBoard`."
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": null,
    "id": "c8fd4460",
    "metadata": {},
    "outputs": [],
@@ -223,7 +223,7 @@
     ")\n",
     "\n",
     "tensorboard = TensorBoard(\n",
-    "    log_dir='./logs',\n",
+    "    log_dir='../logs',\n",
     "    histogram_freq=1,\n",
     "    write_graph=True\n",
     ")"