Add protoc and comments about annotations

Author: Abhilash Iyer

get-started-demo/Manufacturing Use Case Hands On Lab.ipynb

@@ -275,6 +275,8 @@
     "\n",
     "At this point, we have configured our environment for use with the TAO toolkit. Now the fun part begins. We start by downloading the labeled data from Azure storage. For this step you will need a SAS token for downloading the images from blob storage. It is expected that you already have an annotations.json in COCO format which has been exported from the Azure Machine Learning labeling project. We will be using an annotations.json file stored in this repository found [here](workspace/data/annotations.json)\n",
     "\n",
+    "Note that this annotations.json file needs to be in absolute format. The TAO toolkit can successfuly train the model only if your coco annotaions are in absolute format. It should not be in Normalized format.\n",
+    "\n",
     "### Download Data from Azure Storage"
    ]
   },