Fix colab link

Author: MarcelRosier

panoptica/example_spine_semantic.ipynb

@@ -33,7 +33,7 @@
     "Otherwise you can follow and execute the tutorial on your browser.\n",
     "In order to start working on the notebook, click on the following button, this will open this page in the Colab environment and you will be able to execute the code on your own (*Google account required*).\n",
     "\n",
-    "<a target=\"_blank\" href=\"https://colab.research.google.com/github/BrainLesion/tutorials/blob/main/BraTS/tutorial.ipynb\">\n",
+    "<a target=\"_blank\" href=\"https://colab.research.google.com/github/BrainLesion/tutorials/blob/main/panoptica/example_spine_semantic.ipynb\">\n",
     "  <img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/>\n",
     "</a>\n",
     "\n",