Bug 18417: (follow-up) Document new shortcuts in dropdown

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

koha-tmpl/intranet-tmpl/prog/en/modules/cataloguing/editor.tt

@@ -260,6 +260,14 @@
         </tr>
     </thead>
     <tbody>
+        <tr>
+            <td>Alt-C</td>
+            <td>Insert copyright symbol (©)</td>
+        </tr>
+        <tr>
+            <td>Alt-P</td>
+            <td>Insert copyright symbol (℗) (sound recordings)</td>
+        </tr>
         <tr>
             <td>Ctrl-D</td>
             <td>Insert delimiter (‡)</td>