Fix: Duplicate example in Vector Databases documentation

[yybmion]

Issue

(Fixes #2562)

I noticed a duplicate example in the Vector Databases documentation. In the section about filter operators (IN, NIN, NOT), the example shown is identical to an earlier example and doesn't actually demonstrate these operators.

Changes

Replace the duplicate example with one that properly demonstrates the IN, NOT, and other operators:

Expression exp = b.and(b.in("genre", "drama", "documentary"), b.not(b.lt("year", 2020))).build();

[ilayaperumalg]

@yybmion Thanks for fixing the example.