small request regarding commits in binutils-gdb.git

[Cary Coutant]

> For the rest of the community, using a meaningful subject, one that
> actually gives a hint at what it does, is something that I have
> found to be really helpful. For instance, "Provide format string
> to as_warn" can be more helpful when scanning through a list
> of commits than "PR gas/16434".

This is all good, but could you clarify what the conventions are now
for where the "PR gas/16434" needs to go in order for the patch to get
sent to bugzilla?

-cary