reallocarr(3): Touch up xrefs.

lib/libc/stdlib/reallocarr.3

@@ -1,4 +1,4 @@
-.\"	$NetBSD: reallocarr.3,v 1.6 2022/08/31 12:17:14 riastradh Exp $
+.\"	$NetBSD: reallocarr.3,v 1.7 2022/08/31 12:18:41 riastradh Exp $
 .\"
 .\" Copyright (c) 2015 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -123,7 +123,7 @@ as a side effect.
 Note that the argument
 .Fa ptrp
 is a pointer to a pointer to allocated memory, unlike
-.Xr realloc
+.Xr realloc 3
 which takes a pointer to allocated memory.
 .Sh RETURN VALUES
 On successful completion,
@@ -163,7 +163,9 @@ if (error)
 assert(data == NULL);
 .Ed
 .Sh SEE ALSO
-.Xr calloc 3
+.Xr calloc 3 ,
+.Xr realloc 3 ,
+.Xr reallocarray 3
 .Sh HISTORY
 .Nm
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