docs(api): describe new `drop_tip()` behavior introduced in PAPI 2.18 #17139

Job	Run time
opentrons package linting	3m 3s
opentrons package tests on windows-2022, python 3.10	5m 40s
opentrons package tests on ubuntu-22.04, python 3.10	4m 27s
opentrons package tests on ubuntu-22.04, python 3.10	3m 27s
opentrons package tests on macos-latest, python 3.10	3m 9s
deploy opentrons package	0s
	19m 46s

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