fix broken link in Binder Timoshenko

This commit fixes a broken link in Binder Timosneko beam example to the Slithering Snake.

examples/Binder/1_Timoshenko_Beam.ipynb

@@ -468,7 +468,7 @@
    "metadata": {},
    "source": [
     "### Important note on saving data:\n",
-    "This current method of plotting data during the simulation is helpful for visualizing how the system evolves, but it is computationally inefficient as we are constantly pausing the simulation to plot. It also does not save data for additional post-processing later. A better method for saving data from a simulation is to use call-back functions. There is information on how to use these functions in the [snake tutorial](./snake.ipynb)"
+    "This current method of plotting data during the simulation is helpful for visualizing how the system evolves, but it is computationally inefficient as we are constantly pausing the simulation to plot. It also does not save data for additional post-processing later. A better method for saving data from a simulation is to use call-back functions. There is information on how to use these functions in the [snake tutorial](./2_Slithering_Snake.ipynb)"
    ]
   }
  ],