News346: correct waitNext() fee_threshold / MAX_MONEY description

[Bartok9]

Summary

• Correct Newsletter Newsletters: add 85 (2020-02-19) #346's description of Bitcoin Core waitNext() / fee_threshold.
• Clarifies that MAX_MONEY is the default fee threshold (disabling fee-based updates), not a level mempool fees must rise "above".

Motivation

Closes #2591.

The English Notable code and documentation changes entry for Bitcoin Core #31283 said waitNext() returns a new template when "mempool fees increase above the MAX_MONEY threshold." That misreads the API:

• BlockWaitOptions::fee_threshold defaults to MAX_MONEY.
• Per Core's own comment on that field, with the default the implementation skips the expensive fee comparison and only returns a new template when the chain tip changes (or on timeout / testnet min-difficulty conditions).
• Callers that want fee-triggered updates set a lower fee_threshold; the wait then returns once total fees in a freshly assembled template are at least that many sats higher than the current template.

This update keeps the historical note but aligns it with the merged API. English-only in this PR; translated copies of #346 still carry the old wording and can follow separately.

Verification

• Compared wording against Bitcoin Core PR #31283 (src/node/types.h BlockWaitOptions docs and the waitNext implementation path that treats fee_threshold < MAX_MONEY as the fee-check gate).
• Cross-checked later Optech summary in Newsletter Newsletter-89:Translate into Japanese #380 (2025-12-19), which already describes waitNext() without the incorrect "above MAX_MONEY" claim.
• Diff limited to one EN newsletter bullet; no YAML, matrix, or site layout changes.
• Did not change FR/DE/ZH/CS/JA Newsletters: add 85 (2020-02-19) #346 translations in this PR (reviewers/translators can update those independently).

Notes for reviewers

• Suggested follow-up (out of scope here): same wording fix in _posts/{fr,de,zh,cs,ja}/newsletters/2025-03-21-newsletter.md.

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