Typo in quickstart tutorial

[p-j-smith]

Hi, thanks for creating atriumdb! I was going through the quickstart tutorial and noticed a small typo:

atriumdb/sdk/docs/source/quickstart.rst

Lines 141 to 142 in 46e6339

	sdk.write_segment(measure_id, device_id, digital_signal, start_time_s, freq=freq_hz,
	scale_m=scale_m, scale_b=scale_b, time_unites="s", freq_units="Hz")

time_unites="s" should be time_units="s" in the call to sdk.write_segment. Happy to make a small PR to fix the typo.