doc: fix v12.0.0 changelog id

PR-URL: nodejs#27368
Reviewed-By: Refael Ackermann <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>

Author: BethGriggs

doc/changelogs/CHANGELOG_V12.md

@@ -28,7 +28,7 @@
   * [io.js](CHANGELOG_IOJS.md)
   * [Archive](CHANGELOG_ARCHIVE.md)
 
-<a id="11.0.0"></a>
+<a id="12.0.0"></a>
 ## 2019-04-23, Version 12.0.0 (Current), @BethGriggs
 
 ### Notable Changes