Documentation: Supplement key exchange supported by Apache MINA
Documentation: Supplement key exchange supported by Apache MINA

Curve25519 and Curve448 kex algorithms were added to Apache MINA in
context of this request: [1]. See also the RFC-8731 for more details:
[2].

[1] https://issues.apache.org/jira/browse/SSHD-704
[2] https://datatracker.ietf.org/doc/html/rfc8731

Release-Notes: Supplement key exchange supported by Apache MINA.
Change-Id: I6c20a2bb9aff36c50c95f3595f953d1db626ff62

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