ref-manual: Updates to cull out qt4 stuff.

Several areas changed throughout the ref-manual to remove qt4
referencing.

(From yocto-docs rev: 9ee721034ceb2bb7b7a9e64f6a6a7a2b3bfd1c82)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/ref-manual/technical-details.xml

@@ -1378,7 +1378,6 @@
                 <literallayout class='monospaced'>
      COMMERCIAL_AUDIO_PLUGINS ?= ""
      COMMERCIAL_VIDEO_PLUGINS ?= ""
-     COMMERCIAL_QT = ""
                 </literallayout>
                 If you want to enable these components, you can do so by making sure you have
                 statements similar to the following
@@ -1388,7 +1387,6 @@
         gst-plugins-ugly-mpegaudioparse"
      COMMERCIAL_VIDEO_PLUGINS = "gst-plugins-ugly-mpeg2dec \
         gst-plugins-ugly-mpegstream gst-plugins-bad-mpegvideoparse"
-     COMMERCIAL_QT ?= "qmmp"
      LICENSE_FLAGS_WHITELIST = "commercial_gst-plugins-ugly commercial_gst-plugins-bad commercial_qmmp"
                 </literallayout>
                 Of course, you could also create a matching whitelist
@@ -1406,9 +1404,8 @@
                 Specifying audio and video plug-ins as part of the
                 <filename>COMMERCIAL_AUDIO_PLUGINS</filename> and
                 <filename>COMMERCIAL_VIDEO_PLUGINS</filename> statements
-                or commercial Qt components as part of
-                the <filename>COMMERCIAL_QT</filename> statement (along
-                with the enabling <filename>LICENSE_FLAGS_WHITELIST</filename>) includes the
+                (along with the enabling
+                <filename>LICENSE_FLAGS_WHITELIST</filename>) includes the
                 plug-ins or components into built images, thus adding
                 support for media formats or components.
             </para>