[DataConnect] Add changelog entry for #7399

The changes in PR #7399 are only kdoc fixes, but will be included in
the next release and need to have an entry in the changelog.

Author: rlazo

firebase-dataconnect/CHANGELOG.md

@@ -1,5 +1,7 @@
 # Unreleased
 
+- [fixed] Addressed minor reference documentation issues (#7399)
+
 # 17.0.1
 
 - [changed] Bumped internal dependencies.