Cleanup: remove redundant doxygen \file argument

Move \ingroup onto same line to be more compact and
make it clear the file is in the group.

source/blender/python/generic/imbuf_py_api.h

@@ -17,8 +17,7 @@
 #ifndef __IMBUF_PY_API_H__
 #define __IMBUF_PY_API_H__
 
-/** \file blender/python/generic/imbuf_py_api.h
- *  \ingroup pygen
+/** \file \ingroup pygen
  */
 
 PyObject *BPyInit_imbuf(void);