[release-notes] Add section on Plasma 5.

[rkratky]

commit 9cb6c88ab18bf929556e738902438be89435ad1b
Author: Robert Krátký <rkratky at redhat.com>
Date:   Wed Apr 15 14:34:11 2015 +0200

    Add section on Plasma 5.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1191067

 en-US/Desktop.xml |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/en-US/Desktop.xml b/en-US/Desktop.xml
index 2ab32c7..30ca1e6 100644
--- a/en-US/Desktop.xml
+++ b/en-US/Desktop.xml
@@ -16,7 +16,7 @@
       Wayland is a compositing display server, using your computer's video hardware for rendering. On systems where Wayland will not run, GDM should transparently fall back to using the X backend.
     </para>
     <para>
-      If you need to disable Wayland for GDM, edit /etc/gdm/custom.conf to reflect the following:
+      If you need to disable Wayland for GDM, edit <filename>/etc/gdm/custom.conf</filename> to reflect the following:
       <screen>
          [daemon]
          WaylandEnable=false
@@ -31,7 +31,9 @@
   </section>
   <section id="desktop-KDE">
     <title>KDE</title>
-    <para />
+    <para>
+      The Plasma desktop in Fedora 22 is upgraded to version 5, which is based on <systemitem class="library">Qt&nbsp;5</systemitem> and <systemitem class="library">KDE&nbsp;Frameworks&nbsp;5</systemitem>. <application>Plasma&nbsp;5</application> has a new theme called Breeze, which offers cleaner visuals and better readability, improves certain workflows and provides a more consistent and polished interface overall. Users familiar with KDE Workspace&nbsp;4 should have no problem adapting to the new environment. The environment has been migrated to a fully hardware-accelerated graphics stack based on <systemitem class="library">OpenGL(ES)</systemitem>.
+    </para>
   </section>
   <section id="desktop-MATE">
 		<title>MATE</title>