add msg to docs

[Borda]

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Part of #1

PR review

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

No Coverage information
0.0% Duplication

[pep8speaks]

Hello @Borda! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file test_docs/source/conf.py:

Line 20:1: E402 module level import not at top of file
Line 145:80: E501 line too long (86 > 79 characters)
Line 153:80: E501 line too long (88 > 79 characters)
Line 226:80: E501 line too long (83 > 79 characters)
Line 237:80: E501 line too long (82 > 79 characters)
Line 243:80: E501 line too long (84 > 79 characters)