fix metadata and update mj_forward link

python/tutorial.ipynb

@@ -466,7 +466,7 @@
       "source": [
         "Hmmm, why the black pixels?\n",
         "\n",
-        "**Answer:** For the same reason as above, we first need to propagate the values in `mjData`. This time we'll call [`mj_forward`](https://mujoco.readthedocs.io/en/latest/APIreference.html#mj-forward), which invokes the entire pipeline up to the computation of accelerations i.e., it computes $\\dot x = f(x)$, where $x$ is the state. This function does more than we actually need, but unless we care about saving computation time, it's good practice to call `mj_forward` since then we know we are not missing anything.\n",
+        "**Answer:** For the same reason as above, we first need to propagate the values in `mjData`. This time we'll call [`mj_forward`](https://mujoco.readthedocs.io/en/latest/APIreference/APIfunctions.html#mj-forward), which invokes the entire pipeline up to the computation of accelerations i.e., it computes $\\dot x = f(x)$, where $x$ is the state. This function does more than we actually need, but unless we care about saving computation time, it's good practice to call `mj_forward` since then we know we are not missing anything.\n",
         "\n",
         "We also need to update the `mjvScene` which is an object held by the renderer describing the visual scene. We'll later see that the scene can include visual objects which are not part of the physical model."
       ]