[Book][Internals] add description for the kernel.finish_request event
feature #3774 [Book][Internals] add description for the kernel.finish_request event (xabbuh)

This PR was merged into the 2.4 branch.

Discussion
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[Book][Internals] add description for the kernel.finish_request event

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes
| Applies to    | 2.4+
| Fixed tickets | #2959

Commits
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f02fb35 [Book][Internals] add description for the kernel.finish_request event