Minor fixes for various gallery examples (#1442)

examples/gallery/apis/stocks_plotly.ipynb

@@ -8,7 +8,7 @@
    "source": [
     "import panel as pn\n",
     "import pandas as pd\n",
-    "import plotly.graph_objs as go\n",
+    "import plotly.graph_objects as go\n",
     "\n",
     "from bokeh.sampledata import stocks\n",
     "\n",

examples/gallery/param/download_upload_csv.ipynb

@@ -194,7 +194,22 @@
     "sample_data_app = SampleDataApp()\n",
     "voltage_app = VoltageApp()\n",
     "\n",
-    "pn.Row(sample_data_app.view(), voltage_app.view(), sizing_mode='stretch_both').servable()"
+    "description = \"\"\"\n",
+    "This application demonstrates the ability to download a file using the FileDownload widget \n",
+    "and uploading a file using the FileInput widget.\n",
+    "</br></br>\n",
+    "Try filtering the data on the left, download the file by clicking on the Download button\n",
+    "and then plot it on the right by uploading that same file.\n",
+    "\"\"\"\n",
+    "\n",
+    "pn.Row(\n",
+    "    sample_data_app.view(),\n",
+    "    pn.Column(\n",
+    "        description,\n",
+    "        voltage_app.view(),\n",
+    "    ),\n",
+    "    sizing_mode='stretch_both'\n",
+    ").servable()"
    ]
   }
  ],

examples/gallery/param/reactive_plots.ipynb

@@ -19,7 +19,7 @@
     "\n",
     "from bokeh.sampledata.iris import flowers\n",
     "\n",
-    "pn.extension(embed=True)"
+    "pn.extension()"
    ]
   },
   {

examples/gallery/simple/save_filtered_df.ipynb

@@ -46,7 +46,7 @@
     "    callback=filtered_file, filename='filtered_autompg.csv'\n",
     ")\n",
     "\n",
-    "pn.Column(pn.Row(years, mpg), fd, pn.panel(filtered_mpg, width=600), width=600)"
+    "pn.Column(pn.Row(years, mpg), fd, pn.panel(filtered_mpg, width=600), width=600).servable()"
    ]
   }
  ],