statfs.2: Update man page for the MNT_NAMEDATTR flag

This patch updates the man page for the MNT_NAMEDATTR flag.

Another man page that explains named attributes will
be introduced in a future commit.

This is a content change.

Reviewed by:	manpages (zaiee)
Fixes:	2ec2ba7e23 ("vfs: Add VFS/syscall support for Solaris style extended attributes")
Differential Revision:	https://reviews.freebsd.org/D49719

lib/libsys/statfs.2

@@ -25,7 +25,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd March 29, 2023
+.Dd April 7, 2025
 .Dt STATFS 2
 .Os
 .Sh NAME
@@ -125,6 +125,9 @@ The file system resides locally.
 Mandatory Access Control (MAC) support for individual objects
 (see
 .Xr mac 4 ) .
+.It Dv MNT_NAMEDATTR
+The file system supports named attributes as described in
+.Xr named_attribute 9 .
 .It Dv MNT_NFS4ACLS
 ACLs in NFSv4 variant are supported.
 .It Dv MNT_NOATIME
@@ -260,7 +263,8 @@ each file or directory name or disk label
 .Pc .
 .Sh SEE ALSO
 .Xr fhstatfs 2 ,
-.Xr getfsstat 2
+.Xr getfsstat 2 ,
+.Xr named_attribute 9
 .Sh HISTORY
 The
 .Fn statfs