feat(api): update v3 API field descriptions

[laviniat1996]

closes #1974

[github-actions]

Skipping AI review because no docs changes in md, mdx, or docs.json

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[novusnota]

Major thanks for annotating the schema! That said, changes diverge from the upstream TON Center API v3 specification. A proper solution requires careful changes to the upstream code, followed by a port of the resulting specification back to the docs.

I'll close this PR, but will preserve the branch so some parts can be reused later. Thanks again!