doc: add missing link for 10.3.0 changelog

PR-URL: #21017
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Matheus Marchini <matheus@sthima.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>

doc/changelogs/CHANGELOG_V10.md

@@ -9,6 +9,7 @@
 </tr>
 <tr>
 <td>
+<a href="#10.3.0">10.3.0</a><br/>
 <a href="#10.2.1">10.2.1</a><br/>
 <a href="#10.2.0">10.2.0</a><br/>
 <a href="#10.1.0">10.1.0</a><br/>