docs(logger): update child logger docs section and snippets

[shdq]

Description of your changes

This PR is intended to improve docs for child loggers (createChild method). It is the last part of improving the child logger implementation, unit tests, and documentation. In the first PR #1178 child Logger implementation was changed, and new tests were introduced, in this PR #1264 implementation was improved, and new tests were introduced that cover all attributes inherited from a parent logger.

How to verify this change

Related issues, RFCs

Issue number: #483

PR status

Is this ready for review?: YES
Is it a breaking change?: NO

Checklist

• My changes meet the tenets criteria
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in areas that should be flagged with a TODO, or hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding changes to the examples
• My changes generate no new warnings
• The code coverage hasn't decreased
• I have added tests that prove my change is effective and works
• New and existing unit tests pass locally and in Github Actions
• Any dependent changes have been merged and published
• The PR title follows the conventional commit semantics

Breaking change checklist

• I have documented the migration process
• I have added, implemented necessary warnings (if it can live side by side)

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[dreamorosi]

Thanks for the PR!

Minor suggestions/rewording on a couple of sentences.

[shdq]

Once a child logger is created, the logger and its parent will act as separate instances of the Logger class, and as such any change to one won't be applied to the other.

I like this sentence! Thanks for the suggestions!

[dreamorosi]

LGTM!

Thank you for the help on this 🎉