[DOC] Binary quantization examples dont work

[SohaibKatariwala]

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All the examples of BQ index creation in this doc dont work because they are missing index setting ( knn: True).
Version: List the OpenSearch version to which this issue applies, e.g. 2.14, 2.12--2.14, or all.

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All the examples of BQ index creation in this doc dont work because they are missing index setting ( knn: True).