68 - minimal conformance requirements

Jari Arkko writes:
> Here's a proposed text change:
> 
>    Note that both peers can have their own policies about what addresses
>    are acceptable to use.  A minimal "mobile client" could have a policy
>    that says that only the responder's address specified in local
>    configuration is acceptable.  This kind of client does not have to
>    send or process ADDITIONAL_*_ADDRESS notifications.  Similarly, a
>    simple "VPN gateway" that has only a single address, and is not going
>    to change it, does not need to send or understand
>    ADDITIONAL_*_ADDRESS notifications.
> 
> =>
> 
>    Note that a node that has only a single address at any given time
>    does not need to send ADDITIONAL_*_ADDRESS notifications, but
>    all nodes that support this specification must understand the reception
>    of such notifications. However, nodes MAY have their own policies
>    about what addresses are acceptable to use.

That is ok for me.
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