Test docs-only change on CI

[findepi]

• for Docs-only or README-changing PRs cannot be merged #27068

Summary by Sourcery

Documentation:

• Add note stating that the change is documentation-only in the Blackhole connector docs

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR introduces a minor update to the Blackhole connector documentation by adding an explicit note that the change is documentation-only.

File-Level Changes

Change	Details	Files
Added a clarifying note in the connector documentation	Inserted 'This is a docs-only change' immediately after the description block	docs/src/main/sphinx/connector/blackhole.md

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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[findepi]

currently based on #27070