Fix option name DPkg::Progress-Fancy in apt.8 manpage (LP: #1310506)

doc/apt.8.xml

@@ -148,7 +148,7 @@
  
  <itemizedlist>
    <listitem>
-     <para>The option <literal>DPkgPM::Progress-Fancy</literal> is enabled.
+     <para>The option <literal>DPkg::Progress-Fancy</literal> is enabled.
      </para>
    </listitem>
    <listitem>