adding note about coords and loglik

Rethinking_2/Chp_07.ipynb

@@ -1498,7 +1498,7 @@
    "source": [
     "#### Setup for Code 7.25+\n",
     "\n",
-    "Have to reproduce m6.6-m6.8 from Code 6.13-6.17 in Chapter 6"
+    "Have to reproduce m6.6-m6.8 from Code 6.13-6.17 in Chapter 6. Note that we have to add `idata_kwargs={\"log_likelihood\": True}` in order to have the log-likelihood of every posterior sample added to our inference data. This is necessary to compute the LOO and WAIC metrics. You can read more about it [here](https://www.pymc.io/projects/docs/en/stable/learn/core_notebooks/model_comparison.html#model-log-likelihood)."
    ]
   },
   {

Rethinking_2/Chp_08.ipynb

@@ -503,6 +503,13 @@
     "#### Code 8.8"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "In PyMC we can use the `coords` argument when defining our model to add dimensions to the inference data object that is returned with the `pm.sample` method. This is helpful for organizing model parameters. You can read more about coordinates and inference data [here](https://cluhmann.github.io/inferencedata/)."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 12,