Documented new -hardlinks mode

xorriso/xorriso.texi

@@ -1043,6 +1043,10 @@ identical properties. The family members all get the same inode number.
 Whether these numbers are respected at mount time depends on the operating
 system.
 @*
+Command -lsl displays hardlink counts if "lsl_count" is enabled. This can
+slow down the command substantially after changes to the ISO image have
+been made. Therefore the default is "no_lsl_count".
+@*
 Commands -update and -update_r track splits and fusions of hard links in
 filesystems which have stable device and inode numbers. This can cause
 automatic last minute changes before the session gets written. Command