confused about specifying upstreams for reverse DNS

[omalez21]

I came across this section for docs: https://github.com/AdguardTeam/AdGuardHome/wiki/Configuration#specifying-upstreams-for-reverse-dns

it seems to specifiy for reverse DNS to add to the upstream section these values

[/in-addr.arpa/]192.168.8.8

while i have seen others say to include the private IP range like this

[/168.192.in-addr.arpa/]192.168.8.8

i'm confused as to which one i should set. currently my private range is 192.168.1.1/24

so i have the upstream as such:

[/168.192.in-addr.arpa/]192.168.1.1

is that correct? im trying to understand the difference between the one mentioned in the docs vs what others have been using?