Documentation shortcoming

[Hiroki Sato]

Dru Lavigne <dru.lavigne at att.net> wrote
  in <1437908470.22608.YahooMailBasic at web184901.mail.gq1.yahoo.com>:

dr> Apparently, this is only required for link local addresses, which
dr> should be clarified in the Handbook. Can someone with more IPv6-clue
dr> suggest a clearer wording so that both cases are understood?

 I have a patch including this kind of clarification and other updates
 (attached).  Can you review this?

-- Hiroki
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