Add SEE ALSO referring to new error.3

man3/err.3

@@ -143,6 +143,7 @@ if ((fd = open(block_device, O_RDONLY, 0)) == \-1)
 	err(1, "%s", block_device);
 .Ed
 .Sh SEE ALSO
+.Xr error 3 ,
 .Xr exit 3 ,
 .Xr printf 3 ,
 .Xr perror 3 ,

man3/errno.3

@@ -510,5 +510,6 @@ However, on (very) old Unix systems, there may be no
 and the declaration is needed.
 .SH "SEE ALSO"
 .BR err (3),
+.BR error (3),
 .BR perror (3),
 .BR strerror (3)

man3/perror.3

@@ -123,4 +123,5 @@ are defined by glibc, but in
 .SH "SEE ALSO"
 .BR err (3),
 .BR errno (3),
+.BR error (3),
 .BR strerror (3)

man3/strerror.3

@@ -143,5 +143,6 @@ if the error number is unknown.
 .SH "SEE ALSO"
 .BR err (3),
 .BR errno (3),
+.BR error (3),
 .BR perror (3),
 .BR strsignal (3)