Fix typo in changelog

changelog.html

@@ -56,7 +56,7 @@ Upcoming changes</a>
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-    Allow the changing the directory used for the extraction of plugin archives via the <code>--pluginroot</code> CLI option (also controllable via the <code>hudson.PluginManager.workDir</code> system property / context parameter. Also document the <code>--webroot</code> CLI parameter in <code>java -jar jenkins.war --help</code>
+    Allow changing the directory used for the extraction of plugin archives via the <code>--pluginroot</code> CLI option (also controllable via the <code>hudson.PluginManager.workDir</code> system property / context parameter. Also document the <code>--webroot</code> CLI parameter in <code>java -jar jenkins.war --help</code>
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-32765">issue 32765</a>)
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