Adding back "instructions"

ImageColorizerColab.ipynb

@@ -183,6 +183,8 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
+    "### Instructions\n",
+    "\n",
     "#### source_url\n",
     "Any direct link to an image should do (will end with extension .jpg, .png, etc). NOTE: If you want to use your own image, upload it first to a site like Imgur. \n",
     "\n",

VideoColorizerColab.ipynb

@@ -210,6 +210,8 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
+    "### Instructions\n",
+    "\n",
     "#### source_url\n",
     "YouTube, Imgur, Twitter, Reddit ... files of type .gif, .gifv and .mp4 work. NOTE: If you want to use your own video, upload it first to a site like YouTube. \n",
     "\n",