Add example for publishing an array type

[maksimdrachov]

yakut/yakut/cmd/publish/_cmd.py

Lines 78 to 109 in 15949ea

	_EXAMPLES = """
	Example: publish constant messages (no embedded expressions, just regular YAML):
	\b
	yakut pub uavcan.diagnostic.record '{text: "Hello world!", severity: {value: 4}}' -N3 -T0.1 -P hi
	yakut pub 33:uavcan.si.unit.angle.scalar 2.31 uavcan.diagnostic.Record 'text: "2.31 radian"'
	Example: publish sinewave with frequency 1 Hz, amplitude 10 meters:
	\b
	yakut pub -T 0.01 1234:uavcan.si.unit.length.scalar '!$ "sin(t * pi * 2) * 10"'
	Example: as above, but control the frequency of the sinewave and its amplitude using sliders 10 and 11
	of the first connected controller (use `yakut joystick` to find connected controllers and their axis mappings):
	\b
	yakut pub -T 0.01 1234:uavcan.si.unit.length.Scalar '{meter: !$ "sin(t * pi * 2 * A(1,10)) * 10 * A(1,11)"}'
	Example: publish 3D angular velocity setpoint, thrust setpoint, and the arming switch state:
	\b
	yakut pub -T 0.1 \\
	5:uavcan.si.unit.angular_velocity.Vector3 '!$ "[A(1,0)*10, A(1,1)*10, (A(1,2)-A(1,5))*5]"' \\
	6:uavcan.si.unit.power.Scalar '!$ A(2,10)*1e3' \\
	7:uavcan.primitive.scalar.Bit '!$ T(1,5)'
	Example: simulate timestamped measurement of voltage affected by white noise with standard deviation 0.25 V:
	\b
	yakut pub -T 0.1 6:uavcan.si.sample.voltage.scalar \\
	'{timestamp: !$ time()*1e6, volt: !$ "A(2,10)*100+normalvariate(0,0.25)"}'
	""".strip()

I think arrays are pretty common, but there's no example on how to publish them.