rtems: Move "Set Errno" group to the API

cpukit/include/rtems/seterr.h

@@ -19,16 +19,16 @@
 #ifndef _RTEMS_SETERR_H
 #define _RTEMS_SETERR_H
 
-/**
- *  @defgroup RTEMSScoreSetErr Set Errno
- *
- *  @ingroup RTEMSScore
- *
- */
-/**@{*/
-
 #include <errno.h>
 
+/**
+ * @defgroup RTEMSAPISetErrno Set Errno
+ *
+ * @ingroup RTEMSAPI
+ *
+ * @{
+ */
+
 /**
  *  This is a helper macro which will set the variable errno and return
  *  the specified value to the caller.