[Int-area] Fragmentation revisited for 'draft-ietf-intarea-t unnels'

Co-authors of 'draft-ietf-intarea-tunnels', Section 3.6 ("Fragmentation") discusses
(The Necessity of) Outer Fragmentation:

https://datatracker.ietf.org/doc/draft-ietf-intarea-tunnels/

   "Outer fragmentation is valid for any tunnel link protocol
   that supports fragmentation (e.g., IPv4 or IPv6), in which the
   tunnel endpoints act as the host endpoints of that protocol."

But, [RFC8900] has correctly declared IPv4 and IPv6  fragmentation "fragile" such
that the use of the word "valid" for these examples needs to be qualified. Better still
would be to cite "Fragmentation Revisited" which discusses the fragile nature of IPv4
and IPv6 fragmentation as a problem statement for a robust alternate solution:

https://datatracker.ietf.org/doc/draft-templin-6man-fwiw/

Proposed edit:

   "Outer fragmentation is valid for any tunnel link protocol
   that supports fragmentation (e.g., IPv4 or IPv6), in which the
   tunnel endpoints act as the host endpoints of that protocol
   (see: [FRAGREV])."

Thank you - Fred

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