Test docs and code change on CI

[findepi]

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

Summary by Sourcery

Add placeholder modifications to the Black Hole connector docs and code to verify CI integration.

Chores:

• Add a note in the Black Hole connector documentation indicating a docs-only change
• Insert a dummy comment in BlackHoleConnector.java to represent a code-only change

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR adds a documentation note and an inline code comment to the BlackHole connector implementation.

File-Level Changes

Change	Details	Files
Clarify documentation intent	Inserted a note indicating the change is docs-only after the overview.	docs/src/main/sphinx/connector/blackhole.md
Annotate code change in connector class	Added an inline comment marking a code change in the BlackHoleConnector class.	plugin/trino-blackhole/src/main/java/io/trino/plugin/blackhole/BlackHoleConnector.java

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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