fix comment of computeSwapStep
#1047
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computeSwapStepdoesn't necessarily compute result of a swap within a single tick, instead should be within a tick boundary.As
sqrtRatioTargetX96may be the price of the next initialized tick(LP liquidity boundary), which may be well beyond a single tick.computeSwapSteponly cares about boundary because liquidity only changes across a boundary, or say, the liquidity doesn't change for intermediate ticks.