Updating changelog for 7.3.9 release

Author: alishamayor

docs/CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Navigation
 
+* [8.1.2](#812)
 * [8.1.1](#811)
 * [8.1.0.1](#8101)
 * [8.1.0](#810)
@@ -18,6 +19,7 @@
 * [8.0.2](#802)
 * [8.0.1](#801)
 * [8.0.0](#800)
+* [7.3.9](#739)
 * [7.3.8](#738)
 * [7.3.7](#737)
 * [7.3.6](#736)
@@ -326,6 +328,17 @@
 
 ---
 
+## 7.3.9
+
+#### What's New?
+* New Splunk Enterprise maintenance patch. For details, see [Fixed issues for 7.3.9](https://docs.splunk.com/Documentation/Splunk/7.3.9/ReleaseNotes/Fixedissues)
+* Bundling in changes to be consistent with the release of [8.1.2](#812)
+
+#### Changes
+* See [8.1.2](#812) changes
+
+---
+
 ## 7.3.8
 
 #### What's New?