tools: add --compress-motion-events to the man page and zsh completion

Fixes: dc249b0ffe ("tools/debug-events: add ability to compress motion events")
Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1443>

completion/zsh/_libinput

@@ -45,6 +45,7 @@ __all_seats()
 		'--verbose[Use verbose output]' \
 		'--show-keycodes[Make all keycodes visible]' \
 		'--grab[Exclusively grab all opened devices]' \
+		'--compress-motion-events[Compress repeated motion events on a TTY]' \
 		'--device=[Use the given device with the path backend]:device:_files -W /dev/input/ -P /dev/input/' \
 		'--udev=[Listen for notifications on the given seat]:seat:__all_seats' \
 		'--apply-to=[Apply configuration options where the device name matches the pattern]:pattern' \

tools/libinput-debug-events.man

@@ -20,6 +20,10 @@ This tool usually needs to be run as root to have access to the
 /dev/input/eventX nodes.
 .SH OPTIONS
 .TP 8
+.B \-\-compress\-motion\-events
+Compress repeated motion, axis, scrool, and gesture update
+events into a single line. This only takes effect if stdout is a TTY.
+.TP 8
 .B \-\-device \fI/dev/input/event0\fR
 Use the given device(s) with the path backend. The \fB\-\-device\fR argument may be
 omitted.