Clarified docs and fixed typo

[Linardos]

Proposed Changes

• Typo fixed and explanations on foggy details added

Checklist

• Tests have been run (pytest --cov=. --cov-report=xml) and the result (coverage report -m) has been pasted here for reviewers.
• CONTRIBUTING guide has been followed.
• PR is based on the current GaNDLF-Synth main branch.
• Non-breaking change (does not break existing functionality): provide as many details as possible for any breaking change.
• Function/class source code documentation added/updated (ensure typing is used to provide type hints, including and not limited to using Optional if a variable has a pre-defined value).
• Code has been blacked for style consistency and linting.
• [] If applicable, version information has been updated in GANDLF/version.py.
• [] If adding a git submodule, add to list of exceptions for black styling in pyproject.toml file.
• Usage documentation has been updated, if appropriate.
• [] If customized dependency installation is required (i.e., a separate pip install step is needed for PR to be functional), please ensure it is reflected in all the files that control the CI, namely: python-test.yml.

[github-actions]

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