In colab demo, spell scipy.signal.windows.triang with subpackage

(preferred as of scipy 1.1.0, required more recently).

PiperOrigin-RevId: 660861750

examples/notebooks/graph_network_shortest_path.ipynb

@@ -1403,7 +1403,7 @@
         "    x = steps_curve\n",
         "    y = [d[k] for d in data_list]\n",
         "\n",
-        "    window = signal.triang(1 + 2 * smoooth_window_half_width)\n",
+        "    window = signal.windows.triang(1 + 2 * smoooth_window_half_width)\n",
         "    window /= window.sum()\n",
         "    y = signal.convolve(y, window, mode=\"valid\")\n",
         "    x = x[smoooth_window_half_width:-smoooth_window_half_width]\n",