Fix (-W)documentation error found by Clang

../../epan/ftypes/../emem.h:34:3: error: empty paragraph passed to '@details'
      command [-Werror,-Wdocumentation]
 */
  ^

svn path=/trunk/; revision=51278

epan/emem.h

@@ -30,8 +30,6 @@
 
 #include "ws_symbol_export.h"
 
-/** @file
- */
 /**  Initialize all the memory allocation pools described below.
  *  This function must be called once when *shark initialize to set up the
  *  required structures.