[gnutls-devel] GnuTLS | certtool: Align warning about --provable with actual code (!1425)

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Daniel Kahn Gillmor created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1425

Project:Branches: dkg/gnutls:fix-provable-constraints to gnutls/gnutls:master
Author:   Daniel Kahn Gillmor




If I try to generate an ed25519 key, it is *not* an ECDSA key.  But I see this warning:

    0 dkg at host:~$ certtool --generate-privkey --provable --key-type ed25519
    Generating a 256 bit EdDSA (Ed25519) private key ...
    The --provable parameter cannot be used with ECDSA keys.
    1 dkg at host:~$

Looking at the code and documentation, it's clear that --provable only
works for RSA and DSA.  This fix aligns the warning message with the
underlying mechanism.

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [x] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)
 * [ ] CI timeout is 2h or higher (see Settings/CICD/General pipelines/Timeout)

## Reviewer's checklist:
 * [ ] 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`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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