Use absolute link for mlhub (microsoft#125)

Author: Tom Augspurger

quickstarts/using-radiant-mlhub-api.ipynb

@@ -36,7 +36,7 @@
    "metadata": {},
    "outputs": [
     {
-     "name": "stdin",
+     "name": "stdout",
      "output_type": "stream",
      "text": [
       "MLHub API Key:  ································································\n"
@@ -551,7 +551,7 @@
     "This tutorial was a quick introduction to working with the Radiant MLHub API in a notebook. For more, see:\n",
     "\n",
     "- [Reading Data from the STAC API](./reading-stac.ipynb)\n",
-    "- [How to use the Radiant MLHub API to browse and download the LandCoverNet dataset](../tutorials/radiant-mlhub-landcovernet.ipynb)"
+    "- [How to use the Radiant MLHub API to browse and download the LandCoverNet dataset](https://github.com/microsoft/PlanetaryComputerExamples/blob/main/tutorials/radiant-mlhub-landcovernet.ipynb)"
    ]
   }
  ],