Extra details in bluealsa-aplay manual page
Extra details in bluealsa-aplay manual page

The time drift caused by rounding errors in the ALSA rate plugin
has led to a number of issues being raised by users. This change
introduces a hint on how to avoid these rounding errors by
carefully choosing the ALSA PCM period time.

Closes #492

Arkq/bluez-alsa,Arkq/bluez-alsa,Arkq/bluez-alsa