[8.1] [DOCS] Improves examples in KQL doc (#144072) (#144849)

# Backport

This will backport the following commits from `main` to `8.1`:
- [[DOCS] Improves examples in KQL doc
(#144072)](#144072)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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BACKPORT-->

Co-authored-by: gchaps <[email protected]>