Fixed overlapping labels in violin example (#4939)

Author: jbednar

examples/gallery/demos/bokeh/life_expectancy_split_violin.ipynb

@@ -57,27 +57,14 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "violin.opts(split='Region', responsive=True, min_height=500, show_legend=True, violin_width=1.5, legend_position='bottom_right', title='Life Expectancy by Year for Asian subregions', fontscale=1.5)"
+    "violin.opts(split='Region', xrotation=90, responsive=True, min_height=500, show_legend=True, violin_width=1.5, legend_position='bottom_right', title='Life Expectancy by Year for Asian subregions', fontscale=1.5)"
    ]
   }
  ],
  "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3",
-   "language": "python",
-   "name": "python3"
-  },
   "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
    "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.7.5"
+   "pygments_lexer": "ipython3"
   }
  },
  "nbformat": 4,