Updated the text of the PID function.

analyze/sibyl/libSibyl/libSibyl/cLibSibyl/cLibSibyl_runtime.h

@@ -617,9 +617,9 @@ cLibSibylRT_syncRetValueSet(
 /**
  * \brief	This function is able to return the PID of the interpeter.
  *
- * This function is used for identifing the process in the log.
- * This will call the underlying C implementation.
- * This means that is can be change. Note that no message in the log is made.
+ * For this the underling OS functions are used. It thus returns the
+ * _actual_ PID of the process. Thus there is no guarantee that the
+ * returned value remains the same accross different calles.
  */
 extern
 Int_t