export tutorials changed in dd88513 (#559)

Co-authored-by: dario-coscia <dario-coscia@users.noreply.github.com>

tutorials/tutorial1/tutorial.ipynb

@@ -218,7 +218,7 @@
     "        problem.input_pts[location].extract(problem.spatial_variables).flatten()\n",
     "    )\n",
     "    plt.scatter(coords, torch.zeros_like(coords), s=10, label=location)\n",
-    "_=plt.legend()"
+    "_ = plt.legend()"
    ]
   },
   {
@@ -421,7 +421,7 @@
     "fig, ax = plt.subplots(nrows=1, ncols=1)\n",
     "ax.plot(pts.extract([\"x\"]), predicted_output, label=\"Neural Network solution\")\n",
     "ax.plot(pts.extract([\"x\"]), true_output, label=\"True solution\")\n",
-    "_=plt.legend()"
+    "_ = plt.legend()"
    ]
   },
   {