[AVT] RTP: IPv6 examples for RTCP SDES CNAME

[Stephen Casner <casner@acm.org>]

At the suggestion of Peter Barany, I added explanation and examples of
IPv6 address formats to the IPv4 cases that were already there for the
format of the RTCP SDES CNAME item.  I expect these are not
controversial.  Is this IPv6 address officially designated for use in
document examples as 192.0.2.0/24 is for IPv4?  Use of a real address
is generally not advised.

                                                        -- Steve

   For example, the standard ASCII
   representation of an IP Version 4 address is "dotted decimal", also
   known as dotted quad, and for IP Version 6, addresses are textually
   represented as eight groups of four hexadecimal digits separated by
   colons.  ...

   Examples are "doe@sleepy.megacorp.com", "doe@192.0.2.89" or
   "doe@2201:056D::112E:144A:1E24" for a multi-user system.  On a system
   with no user name, examples would be "sleepy.megacorp.com",
   "192.0.2.89" or "2201:056D::112E:144A:1E24".

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