add the sample qrcode

doc/ui-mockups/share-ui-mockup.svg

@@ -2343,16 +2343,16 @@
              sodipodi:role="line">Jerome Charaoui &lt;jerome@riseup.net&gt;</tspan></text>
       </g>
       <image
-         sodipodi:absref="/home/anarcat/src/monkeysign/doc/ui-mockups/monkeycode-jerome.png"
-         xlink:href="monkeycode-jerome.png"
+         sodipodi:absref="/home/anarcat/src/monkeysign/doc/ui-mockups/monkeycode-example.png"
+         xlink:href="monkeycode-example.png"
          width="367.89749"
          height="385.52151"
          id="image8611"
          x="1343.0221"
          y="1332.2283" />
       <image
-         sodipodi:absref="/home/anarcat/src/monkeysign/doc/ui-mockups/monkeycode-jerome.png"
-         xlink:href="monkeycode-jerome.png"
+         sodipodi:absref="/home/anarcat/src/monkeysign/doc/ui-mockups/monkeycode-example.png"
+         xlink:href="monkeycode-example.png"
          width="367.89749"
          height="385.52151"
          id="image8611-4"

doc/ui-mockups/share-ui.glade

@@ -33,7 +33,7 @@ You may ask someone to point their camera device at this screen and sign your ke
               <object class="GtkImage" id="Monkeycode">
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
-                <property name="pixbuf">monkeycode-jerome.png</property>
+                <property name="pixbuf">monkeycode-example.png</property>
               </object>
               <packing>
                 <property name="expand">False</property>

doc/ui-mockups/sign-ui.glade

@@ -30,7 +30,7 @@
           <object class="GtkImage" id="fakecamera-image">
             <property name="visible">True</property>
             <property name="can_focus">False</property>
-            <property name="pixbuf">monkeycode-jerome.png</property>
+            <property name="pixbuf">monkeycode-example.png</property>
           </object>
           <packing>
             <property name="expand">False</property>