Fix typo

changelog.html

@@ -82,7 +82,7 @@ Upcoming changes</a>
     Builds of a concurrently executable job might end up colliding on the same workspace.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-10615">issue 10615</a>)
   <li class=bug>
-    Fixed error during installtion .deb package (/var/run/jenkins doesn't exists)
+    Fixed error during installation of .deb package (/var/run/jenkins doesn't exists)
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-20407">issue 20407</a>)
   <li class=bug>
     Global search box now remembers entered text