12063 Convert free_rtn(9S) to mandoc

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  FREE_RTN(9S)              Data Structures for Drivers             FREE_RTN(9S)
  
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- 
  NAME
         free_rtn - structure that specifies a driver's message-freeing routine
  
  SYNOPSIS
         #include <sys/stream.h>
  
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  INTERFACE LEVEL
         Architecture independent level 1 (DDI/DKI).
  
  DESCRIPTION
         The  free_rtn structure is referenced by the  datab structure. When
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*** 20,37 ****
  
  STRUCTURE MEMBERS
           void     (*free_func)()      /* user's freeing routine */
           char     *free_arg           /* arguments to free_func() */
  
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- 
         The  free_rtn structure is defined as type  frtn_t.
  
  SEE ALSO
         esballoc(9F), freeb(9F), datab(9S)
  
  
!        STREAMS Programming Guide
! 
! 
! 
!                                November 13, 1996                  FREE_RTN(9S)
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  STRUCTURE MEMBERS
         void     (*free_func)()      /* user's freeing routine */
         char     *free_arg           /* arguments to free_func() */
  
       The free_rtn structure is defined as type frtn_t.
  
  SEE ALSO
       esballoc(9F), freeb(9F), datab(9S)
  
+      STREAMS Programming Guide.
  
! illumos                          July 9, 2018                          illumos