add link to blog and rephrase intro

Author: jyaistMap

guide/02-api-overview/overview243.ipynb

@@ -7,7 +7,7 @@
    "source": [
     "## Summary\n",
     "\n",
-    "See the [Release Notes for 2.4.3](../release-notes-243) for a comprehensive list of changes since the 2.4.2 release.\n",
+    "See below for brief introductions to some new features introduced with the ArcGIS Python API 2.4.3 release. Also, checkout the [What's new in ArcGIS API for Python 2.4.3](https://www.esri.com/arcgis-blog/products/api-python/announcements/whats-new-in-arcgis-api-for-python-2-4-3) blog for additional areas updated in the API. For a comprehensive list of changes since the 2.4.2 release, visit the [Release Notes for 2.4.3](../release-notes-243) document.\n",
     "\n",
     "### Dependency Management changes\n",
     "The 2.4.3 Release upgraded some major dependencies within the *arcgis* package:\n",