Trivial.

changelog.html

@@ -68,7 +68,7 @@ Upcoming changes</a>
     JNA-related error from Windows slave monitoring thrown repeatedly.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-15796">issue 15796</a>)
   <li class=rfe>
-    Improved the request handling performance (where the file lookup is expensive, such as NFS.)
+    Improved the request handling performance (where the file lookup is expensive, such as on NFS).
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-16606">issue 16606</a>)
   <li class=rfe>
     Improved the duration browsers cache static resources.