Fixed typos

Author: DavidJVitale

guide/02-api-overview/release-notes.ipynb

@@ -13,9 +13,9 @@
    "source": [
     "#### New\n",
     "* Updated the **[`Map Widget`](https://esri.github.io/arcgis-python-api/apidoc/html/arcgis.widgets.html#mapview)** to use the **[ArcGIS API for JavaScript 4x](https://developers.arcgis.com/javascript/)** release\n",
-    "  * Broader support for authorign and rendering `WebScenes`\n",
+    "  * Broader support for authoring and rendering `WebScenes`\n",
     "  * Full support for [`JupyterLab`](http://jupyterlab.readthedocs.io/en/stable/getting_started/overview.html). See **[JupyterLab Guide](http://../using-the-jupyter-lab-environment)**.\n",
-    "  * Support for specfiying `autocast` JavaScript renderers from Python code\n",
+    "  * Support for specifying `autocast` JavaScript renderers from Python code\n",
     "  * Support for exporting `Map Widgets` to standalone HTML pages\n",
     "  * Support for using an external ArcGIS API for JavaScript CDN for disconnected environments\n",
     "  * Miscellaneous bug fixes\n",