Is tune.quic.backend.max-idle-timeout missing from the documentation?

[Nick Ramirez]

The HAProxy source code indicates that there is a directive named 
'tune.quic.backend.max-idle-timeout': haproxy/src/cfgparse-quic.c at 
f473eb72066e02d44837fd77110b6ca5bdea97e2 · haproxy/haproxy (github.com) 
<https://github.com/haproxy/haproxy/blob/f473eb72066e02d44837fd77110b6ca5bdea97e2/src/cfgparse-quic.c#L121>. 
But I do not find it in the documentation. Is it missing? There is 
'tune.quic.frontend.max-idle-timeout'.

Thank you,
Nick Ramirez