Revert "Update package.json"

This reverts commit 77d2987293599dd2553d56aa953119a6ee81854a.

com.unity.perception/package.json

   "samples":[
     {
       "displayName": "Tutorial Files",
-      "description": "These files accompamy the tutorial for the Perception Package",
+      "description": "These files accompamy the tutorial for the Perception Package, found at https://github.com/Unity-Technologies/com.unity.perception/blob/tutorial_sample_project/Tutorial/TUTORIAL.md",
       "path" : "Samples~/Tutorial Files"
     }
   ]