doc: fix CHANGELOG.md parsing issue

PR-URL: #34923
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

CHANGELOG.md

@@ -331,7 +331,7 @@ release.
 
 ## 2015-09-08, Version 4.0.0 (Stable), @rvagg
 
-<a href="doc/changelogs/CHANGELOG_V4.md#4.0.0>Moved to doc/changelogs/CHANGELOG_V6.md#6.0.0</a>.
+<a href="doc/changelogs/CHANGELOG_V4.md#4.0.0">Moved to doc/changelogs/CHANGELOG_V6.md#6.0.0</a>.
 
 ## 2015-09-02, Version 3.3.0, @rvagg