INTPYTHON-605 Removed unused vector_index_name from docstring and a u… #439

Job	Run time
pre-commit	11s
build	6s
API docs	33s
cd libs/langchain-mongodb / run lint #3.9	1m 8s
cd libs/langchain-mongodb / run lint #3.12	1m 10s
cd libs/langchain-mongodb / run test #3.9	5m 35s
cd libs/langchain-mongodb / run test #3.12	5m 25s
CI Success	1s
	14m 9s

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