12063 Convert free_rtn(9S) to mandoc

@@ -1,16 +1,13 @@
 FREE_RTN(9S)              Data Structures for Drivers             FREE_RTN(9S)
 
-
-
 NAME
        free_rtn - structure that specifies a driver's message-freeing routine
 
 SYNOPSIS
        #include <sys/stream.h>
 
-
 INTERFACE LEVEL
        Architecture independent level 1 (DDI/DKI).
 
 DESCRIPTION
        The  free_rtn structure is referenced by the  datab structure. When

@@ -20,18 +17,13 @@
 
 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.
 
-       STREAMS Programming Guide
-
-
-
-                               November 13, 1996                  FREE_RTN(9S)
+illumos                          July 9, 2018                          illumos