Update AIRPLAY2.md

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 AirPlay 2 -- More About What Works
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-* Two types of audio are received by Shairport Sync -- "Realtime" streams of CD quality ALAC (like AirPlay 1) and "Buffered Audio" streams of AAC stereo at 44,100 frames per second. The selection of stream type is made by the player.
+* Two types of audio are received by Shairport Sync -- "Realtime" streams of CD quality ALAC (like AirPlay 1) and "Buffered Audio" streams of AAC stereo at 44,100 frames per second. The selection of stream type is made by the player. Realtime streams generally have a latency of about two seconds. Buffered Audio streams typically have a latency of half a second or less.
 * Audio is synchronised with other AirPlay 2 devices, including AirPlay 2 devices that have their own master clocks.
 * Shairport Sync offers AirPlay 1 compatibility for situations where iTunes on macOS or macOS Music plays to multiple speakers and where one of more of them is compatible with AirPlay 1 only.