Spearbit #55: Clarified the documentation of the derivatives used in LPMath

[jalextowle]

Addresses Spearbit Issue #55.

[github-actions]

Hyperdrive Gas Benchmark

Benchmark suite	Current: eaaca79	Previous: 46c834d	Deviation	Status
addLiquidity: min	34062 gas	1546 gas	2103.2342%	🚨
addLiquidity: avg	140794 gas	67936 gas	107.2451%	🚨
addLiquidity: max	357573 gas	293159 gas	21.9724%	🚨
checkpoint: min	29254 gas	1182 gas	2374.9577%	🚨
checkpoint: avg	105980 gas	48477 gas	118.6191%	🚨
checkpoint: max	200343 gas	191559 gas	4.5855%	🚨
closeLong: min	31422 gas	1492 gas	2006.0322%	🚨
closeLong: avg	99541 gas	29374 gas	238.8745%	🚨
closeLong: max	217496 gas	152303 gas	42.8048%	🚨
closeShort: min	31335 gas	1494 gas	1997.3896%	🚨
closeShort: avg	98224 gas	33444 gas	193.6969%	🚨
closeShort: max	180066 gas	149156 gas	20.7233%	🚨
initialize: min	31328 gas	1451 gas	2059.0627%	🚨
initialize: avg	248520 gas	213962 gas	16.1515%	🚨
initialize: max	319514 gas	253953 gas	25.8162%	🚨
openLong: min	33503 gas	1499 gas	2135.0233%	🚨
openLong: avg	126972 gas	51658 gas	145.7935%	🚨
openLong: max	248238 gas	185562 gas	33.7763%	🚨
openShort: min	33798 gas	1520 gas	2123.5526%	🚨
openShort: avg	136249 gas	51482 gas	164.6537%	🚨
openShort: max	330066 gas	181325 gas	82.0301%	🚨
redeemWithdrawalShares: min	46869 gas	1488 gas	3049.7984%	🚨
redeemWithdrawalShares: avg	73017 gas	22375 gas	226.3330%	🚨
redeemWithdrawalShares: max	143334 gas	109301 gas	31.1370%	🚨
removeLiquidity: min	31161 gas	1530 gas	1936.6667%	🚨
removeLiquidity: avg	208504 gas	151225 gas	37.8767%	🚨
removeLiquidity: max	325574 gas	325781 gas	-0.0635%	✅

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