filetop: Add missing entry of -a in the SYNOPSIS section
.SH NAME
filetop \- File reads and writes by filename and process. Top for files.
.SH SYNOPSIS
-.B filetop [\-h] [\-C] [\-r MAXROWS] [\-s {reads,writes,rbytes,wbytes}] [\-p PID] [interval] [count]
+.B filetop [\-h] [\-a] [\-C] [\-r MAXROWS] [\-s {reads,writes,rbytes,wbytes}] [\-p PID] [interval] [count]
.SH DESCRIPTION
This is top for files.
