typo fix. Thanks Jesse

changelog.html

@@ -92,7 +92,7 @@ Upcoming changes</a>
     Rotation of slave agent launch logs is broken for Windows masters.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-15408">issue 15408</a>)
   <li class=bug>
-    Failure to initialie the SSH daemon shouldn't fail the boot.
+    Failure to initialize the SSH daemon shouldn't fail the boot.
   <li class=rfe>
     Added new GUI-based slave installer for upstart
   <li class=bug>