Fixed issue with Doxygen command @deprecated.

Fixed issue with use of Doxgen command @deprecated. According to the
Doxygen documentation, the "command ends when a blank line or some other
sectioning command is encountered". So, an empty line has been added to
avoid wrong parsing and generation of the "Deprecated List" in the HTML
documentation.

dcmdata/include/dcmtk/dcmdata/dcpixel.h

@@ -1,6 +1,6 @@
 /*
  *
- *  Copyright (C) 1994-2021, OFFIS e.V.
+ *  Copyright (C) 1994-2024, OFFIS e.V.
  *  All rights reserved.  See COPYRIGHT file for details.
  *
  *  This software and supporting documentation were developed by
@@ -477,6 +477,7 @@ class DCMTK_DCMDATA_EXPORT DcmPixelData : public DcmPolymorphOBOW
      *    is equal to the default representation parameters
      *  @deprecated The direct call of this method by user code is deprecated.
      *    Use DcmDataset::chooseRepresentation() instead.
+     *
      *  @repType the representation type
      *  @repParam the representation parameters
      *  @stack the object stack