HardwarePWM: Fix period unit in comments to uS instead of nS #1055
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1000 ms are 1000 * 0,001s = 1s which gives a frequency of 1/1 = 1 Hz
instead of 1 KHz. Now either the period or the frequency is wrong. Turns
out it's the period as the ESP8266 Technical Reference associates
1000 uS with 1 KHz.