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4e71a170 - nit: pgvector python example notebook, fix variable reference (#5595)

nit: pgvector python example notebook, fix variable reference (#5595) # Your PR Title (What it does) Fixes the pgvector python example notebook : one of the variables was not referencing anything ## Before submitting ## Who can review? Community members can review the PR once tests pass. Tag maintainers/contributors who might be interested: VectorStores / Retrievers / Memory - @dev2049