doc: fix typo in changelog

PR-URL: #3353
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Rod Vagg <rod@vagg.org>

CHANGELOG.md

@@ -20,7 +20,7 @@
 
 * [[`b3cbd13340`](https://github.com/nodejs/node/commit/b3cbd13340)] - **buffer**: fix assertion error in WeakCallback (Fedor Indutny) [#3329](https://github.com/nodejs/node/pull/3329)
 * [[`102cb7288c`](https://github.com/nodejs/node/commit/102cb7288c)] - **doc**: label v4.2.0 as LTS in changelog heading (Rod Vagg) [#3343](https://github.com/nodejs/node/pull/3343)
-* [[`c245a199a7`](https://github.com/nodejs/node/commit/c245a199a7)] - **lib**: fix undefined timeout regression (Ryan Graham) [#3331](https://github.com/nodejs/node/pull/3331
+* [[`c245a199a7`](https://github.com/nodejs/node/commit/c245a199a7)] - **lib**: fix undefined timeout regression (Ryan Graham) [#3331](https://github.com/nodejs/node/pull/3331)
 
 ## 2015-10-07, Version 4.2.0 'Argon' (LTS), @jasnell