doc: fix Node.js 14.x changelogs

Remove the table headings for Node.js 13.x that were not removed in
631dd21.

Vertically align the list of releases in the 14.x changelog as they
are in the changelogs for 12.x and 10.x.

PR-URL: #35756
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>
Reviewed-By: Shelley Vohr <codebytere@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

CHANGELOG.md

@@ -3,7 +3,7 @@
 Select a Node.js version below to view the changelog history:
 
 * [Node.js 14](doc/changelogs/CHANGELOG_V14.md) **Current**
-* [Node.js 13](doc/changelogs/CHANGELOG_V13.md) **Current**
+* [Node.js 13](doc/changelogs/CHANGELOG_V13.md) End-of-Life
 * [Node.js 12](doc/changelogs/CHANGELOG_V12.md) **Long Term Support**
 * [Node.js 11](doc/changelogs/CHANGELOG_V11.md) End-of-Life
 * [Node.js 10](doc/changelogs/CHANGELOG_V10.md) Long Term Support
@@ -25,7 +25,6 @@ release.
 <table>
 <tr>
   <th title="Current"><a href="doc/changelogs/CHANGELOG_V14.md">14</a><sup>Current</sup></th>
-  <th title="Current"><a href="doc/changelogs/CHANGELOG_V13.md">13</a><sup>Current</sup></th>
   <th title="LTS Until 2022-04"><a href="doc/changelogs/CHANGELOG_V12.md">12</a><sup>LTS</sup></th>
   <th title="LTS Until 2021-04"><a href="doc/changelogs/CHANGELOG_V10.md">10</a><sup>LTS</sup></th>
 </tr>

doc/changelogs/CHANGELOG_V14.md

@@ -9,7 +9,7 @@
 <th>Current</th>
 </tr>
 <tr>
-<td>
+<td valign="top">
 <a href="#14.14.0">14.14.0</a><br/>
 <a href="#14.13.0">14.13.0</a><br/>
 <a href="#14.12.0">14.12.0</a><br/>