[kde-doc-english] A fix for Showfoto doc

[Antoni Bella Pérez]

  Hi

  Fix it, please. 

   <!ENTITY showfoto '<application>Showfoto</application>'>
-  <!ENTITY digikam '<application>Showfoto</application>'>
+  <!ENTITY digikam '<application>digiKam</application>'>
   <!-- relative path to snapshots for showfoto -->

  Regards
  Toni