remove the gnome-apt reference as it is removed from unstable

debian/changelog

@@ -34,6 +34,7 @@ apt (0.7.26~exp5) UNRELEASED; urgency=low
   * doc/apt-get.8.xml:
     - do not say explicit target_release_{name,version,codename}, it should
       be clear by itself and 'man' can break lines again (Closes: #566166)
+    - remove the gnome-apt reference as it is removed from unstable
 
   [ Jari Aalto ]
   * debian/rules:

doc/apt-get.8.xml

@@ -112,7 +112,7 @@
    <para><command>apt-get</command> is the command-line tool for handling packages, and may be 
    considered the user's "back-end" to other tools using the APT
    library.  Several "front-end" interfaces exist, such as &dselect;,
-   &aptitude;, &synaptic;, &gnome-apt; and &wajig;.</para>
+   &aptitude;, &synaptic; and &wajig;.</para>
 
    <para>Unless the <option>-h</option>, or <option>--help</option> option is given, one of the
    commands below must be present.</para>

doc/apt.ent

@@ -142,12 +142,6 @@
   </citerefentry>"
 >
 
-<!ENTITY gnome-apt "<citerefentry>
-    <refentrytitle><command>gnome-apt</command></refentrytitle>
-    <manvolnum>1</manvolnum>
-  </citerefentry>"
->
-
 <!ENTITY wajig "<citerefentry>
     <refentrytitle><command>wajig</command></refentrytitle>
     <manvolnum>1</manvolnum>