docs: better comments for PickingUpItem functions #6489

Job	Run time
get-test-packages	4s
get-build-packages	6s
get-lint-packages	7s
monorepo-lint	1m 6s
test (isaacscript-cli)	29s
test (eslint-plugin-isaacscript)	32s
build (docs)	27s
build (isaac-typescript-definitions-repentogon)	30s
build (isaac-lua-polyfill)	24s
build (isaacscript-common)	51s
build (isaac-typescript-definitions)	28s
build (isaacscript-cli)	36s
build (eslint-plugin-isaacscript)	33s
lint (eslint-plugin-isaacscript)	44s
lint (docs)	42s
lint (eslint-config-isaacscript)	37s
lint (isaac-typescript-definitions-repentogon)	44s
lint (isaacscript-common)	1m 14s
lint (isaac-typescript-definitions)	42s
lint (isaacscript-spell)	33s
lint (isaac-lua-polyfill)	32s
lint (isaacscript-cli)	46s
Discord Failure Notification	0s
	12m 47s

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