Update from code changes: B20 Asset multiplier ERC-8056 UI vocabulary

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Summary

Refresh the B20 Asset variant multiplier reference on the Beryl B20 page so it matches the ERC-8056 "UI Multiplier" vocabulary that IB20Asset now advertises.

Changes

• Rename the canonical Multiplier surface to updateUIMultiplier(newMultiplier, effectiveAt), toUIAmount, and fromUIAmount, and note that the legacy updateMultiplier / toScaledBalance / toRawBalance selectors remain callable as deprecated aliases.
• Add the new MAX_UI_MULTIPLIER() getter (returns type(uint128).max, the setter bound) and the cancelUIMultiplierUpdate() entry.
• Call out the ERC-8056 Conversion extension (interface id 0x57854fc3) and the UIMultiplierUpdateExists / UIMultiplierUpdateDoesNotExist error semantics.
• Document the instant setter's dual event emission (MultiplierUpdated + UIMultiplierUpdated) and the UIMultiplierUpdateCancelled emission when a live pending update is cleared.

Context

Follows the Aug 4 2026 B20 interface review; source PR: base/base-std#192.

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