argon2: update RFC 9106 parameter recommendations

[harjothkhara]

Update the IDKey example to use RFC 9106's first recommended Argon2id
option and clarify the relationship between the first and second
recommended options.

Fixes golang/go#79823

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Patch Set 1:

(1 comment)

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Message from Harjoth Khara:

Patch Set 2:

(1 comment)

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[riklongo]

It seems like I cannot comment on Gerrit, so I'll reply here.

The proposed changes are clear and they address the mismatch with the RFC.
However I would use the first recommended option in the example instead of the second recommended option, since it is likely that a developer copy-pastes the example without carefully reading the documentation, so I think it would be better to put the first recommended option in the spotlight.

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