gnutls-cli-debug: mention RFC8446 for TLS1.3 and RFC8422 for X25519
This updates the draft names used in gnutls-cli-debug.
Checklist
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Code modified for feature -
Test suite updated with functionality tests
Reviewer's checklist:
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Any issues marked for closing are addressed -
There is a test suite reasonably covering new functionality or modifications -
Function naming, parameters, return values, types, etc., are consistent and according to CONTRIBUTION.md
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This feature/change has adequate documentation added -
No obvious mistakes in the code