Update faq.md (#653)

Added RTC verbiage
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@ -421,3 +421,11 @@ As a first step, we recommend carefully reading our documentation on [GitHub](ht
??? question "PiKVM complains about low power warnings"
* Are you using a "proper" power supply? Not one you hacked together?
* Some USB power bricks advertise 5V 2.1A or higher, but can't deliver consistent 5V. Best to use Raspberry Pi Foundation recommended power supplies.
??? question "PiKVM complains about a RTC low voltage detected, date/time is not reliable"
* This is mearly a warning that can be ignored however, the following resolves the issue:
* Leave plugged in for 24+ hours and or
* Connect to the internet using the eth cable, the internal NTP service will set the time accordlingly
* Force a time sync: `rw && hwclock --systohc"` or `"rw && hwclock -w"`
* Set date and time manually can be found [here.](https://www.cyberciti.biz/faq/howto-set-date-time-from-linux-command-prompt/)