Add reminder to sync time in documentation

[40ZqTYY4ag3tAO4hdlxR1]

Please add reminder to sync system time with a NTP server as Step #1

Mine had drifted and led to some TOTPs not working, till I performed this crucial step.

Source of problem = user error.

[AndreStork]

Same problem (even though it's ~2 seconds earlier so switching app or copying it manually is enough to get the right code), but yeah please add this it's very important and it's an easy step to miss and could lead to worse results than mine.