opensnoop: update synopsis in man page
.SH NAME
opensnoop \- Trace open() syscalls. Uses Linux eBPF/bcc.
.SH SYNOPSIS
-.B opensnoop [\-h] [\-T] [\-x] [\-p PID] [\-t TID] [\-d DURATION] [\-n name]
+.B opensnoop.py [\-h] [\-T] [\-U] [\-x] [\-p PID] [\-t TID] [\-u UID]
+ [\-d DURATION] [\-n NAME] [\-e] [\-f FLAG_FILTER]
.SH DESCRIPTION
opensnoop traces the open() syscall, showing which processes are attempting
to open which files. This can be useful for determining the location of config
