docs: fix price_diff_ema clamp bound#210
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Summary
price_diff_emaformula: the clamp upper bound wasmax_premium(dimensionless) but should beoracle_price × max_premium(in price units, consistent with the subtractionclearing_or_mid − oracle_priceinside the EMA)max_premiumdescription to match:clamped to oracle_price × max_premiumChanges
doc/protocol/perpetuals.md