correct the maximum number of sequences in the mark(1) man page
[mmh] / test /
drwxr-xr-x   ..
-rw-r--r-- 1541 README
drwxr-xr-x - bad-input
-rwxr-xr-x 387 cleanup
-rw-r--r-- 2355 common.sh.in
drwxr-xr-x - folder
drwxr-xr-x - inc
drwxr-xr-x - manpages
drwxr-xr-x - mhbuild
drwxr-xr-x - mhshow
drwxr-xr-x - new
drwxr-xr-x - pick
drwxr-xr-x - repl
drwxr-xr-x - scan
drwxr-xr-x - whatnow