add doc link for primefaces v12

[justsomeone]

Hello team

thanks for your great work

according to this page https://www.primefaces.org/documentation/ the doc for version 12 is not listed

while it can be accessed with little modification to version 11 link
https://primefaces.github.io/primefaces/12_0_0/

thanks and have a nice day

[Melloware]

Thanks I will let them know.

[justsomeone]

Thanks I will let them know.

@Melloware
thanks for you and for the whole team

[Melloware]