docs: add guide for using BackendRef Filters

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#3,906 opened on Jul 20, 2024 7 comments 0 reactions 1 assignee Claimed by @Manoramsharma View on GitHub

documentation stale

Description

*Description*:
>Describe the desired behavior, what scenario it enables and how it
would be used.

[optional *Relevant Links*:]
>Any extra documentation required to understand the issue.

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