FYI, updated FAQ to request more information for the CSRs of backports

[Joe Darcy]

Hello,

FYI, I updated the CSR FAQ to explicitly ask for more information for 
the CSRs of backports:

> The CSR for the backport should explicitly state how the interface 
> change for the backport relates to the interface change for the main 
> release: either the interface change is the same or, if it differs, 
> what the difference is.
https://wiki.openjdk.java.net/display/csr/CSR+FAQs

Thanks,

-Joe