fix: Update content/covidcast/release-log/headless/v2.3.0.md

Co-authored-by: chinandrew <chinandrew96@gmail.com>

Author: sgratzl

content/covidcast/release-log/headless/v2.3.0.md

@@ -7,6 +7,7 @@ date: 2021-04-15
  * Explore Correlations: Explore correlations between different indicators
  * Annotation Overview: Show all data anomalies recorded in COVIDcast in a central place
  * Expandable Line Charts: Expand the line chart of indicators to show the full historic range
+* HHS and Nation Support: The classic map now supports displaying HHS region and national level data
 
 
-More information: https://github.com/cmu-delphi/www-covidcast/releases/tag/v2.3.0
+More information: https://github.com/cmu-delphi/www-covidcast/releases/tag/v2.3.0