doc: align links in table to top

PR-URL: #41396
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Shelley Vohr <shelley.vohr@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Derek Lewis <DerekNonGeneric@inf.is>

doc/changelogs/CHANGELOG_V16.md

@@ -8,12 +8,12 @@
 <th>Current</th>
 </tr>
 <tr>
-<td>
+<td valign="top">
 <a href="#16.13.2">16.13.2</a><br/>
 <a href="#16.13.1">16.13.1</a><br/>
 <a href="#16.13.0">16.13.0</a><br/>
 </td>
-<td>
+<td valign="top">
 <a href="#16.12.0">16.12.0</a><br/>
 <a href="#16.11.1">16.11.1</a><br/>
 <a href="#16.11.0">16.11.0</a><br/>