Add missing PR links and "Unreleased" section to changelog

Author: mokagio

CHANGELOG.md

@@ -30,19 +30,35 @@ _None._
 
 -->
 
-## 7.3.1
+## Unreleased
+
+### Breaking Changes
+
+_None._
+
+### New Features
+
+_None._
 
 ### Bug Fixes
 
-- Fix a regression where app-based 2FA stopped working on accounts with passkeys enabled
+_None._
+
+### Internal Changes
+
+_None._
 
+## 7.3.1
+
+### Bug Fixes
+
+- Fix a regression where app-based 2FA stopped working on accounts with passkeys enabled. [#802]
 
 ## 7.3.0
 
 ### New Features
 
-- Make extensions for `LoginFacade` and `Data` public to be accessible from external modules.
-
+- Make extensions for `LoginFacade` and `Data` public to be accessible from external modules. [#798]
 
 ## 7.2.1