Small typo fixes in linear regression notebook

Author: han-ol

examples/Linear_Regression_Starter.ipynb

@@ -1170,7 +1170,7 @@
     "        r\"$\\beta_0 + \\beta_1$\": lambda data: np.sum(data[\"beta\"], axis=-1),\n",
     "        r\"$\\log p(x|\\beta,\\sigma)$\": joint_log_likelihood,\n",
     "    },\n",
-    "    variable_keys=[],  # we just want to show  SBC for the custom test quantities\n",
+    "    variable_keys=[],  # we just want to show SBC for the custom test quantities\n",
     "    difference=True,\n",
     "    rank_type=\"distance\"\n",
     ")"
@@ -1341,7 +1341,16 @@
    "name": "python3"
   },
   "language_info": {
-   "name": "python"
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.11.11"
   },
   "widgets": {
    "application/vnd.jupyter.widget-state+json": {