[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.

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.
All the examples of BQ index creation in this doc dont work because they are missing index setting ( knn: True).

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