Issue-235: Fix Documentation not showing up on the website

[Amalicia]

This PR adjusts the method scopes in order to allow Scaladoc to correctly generate documentation.

Description

TODO

Related Issue and dependencies

• Resolves https://github.com/hablapps/doric/issues/235

How Has This Been Tested?

• This pull request contains appropriate tests?:
  • YES / NO
  • Something relevant to mention

[codecov[bot]]

Codecov Report

Merging #343 (a463104) into main (5fe194b) will not change coverage. The diff coverage is n/a.

Additional details and impacted files

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[github-actions[bot]]

:octocat: This is an auto-generated comment created by:

• Date : 2023-04-22 17:37:29 +0000 (UTC)
• Workflow : PR comment
• Job name : create_test_summary_report
• Run : 4773970703
• Commit : a463104dd237a56928a58eb08531d86a393a89fa feat: [+] issue #235 todo docs and rebase

Actor	Triggering actor	Sender
eruizalo	eruizalo	eruizalo
Triggered by: - Workflow name: "CI" at .github/workflows/ci.yml - URL: [https://github.com/hablapps/doric/actions/runs/4773917416](https://github.com/hablapps/doric/actions/runs/4773917416) - on workflow_run:completed

Test summary report 📊

Spark version	testing
2.4.1
2.4.2
2.4.3
2.4.4
2.4.5
2.4.6
2.4.7
2.4
3.0.0
3.0.1
3.0.2
3.0
3.1.0
3.1.1
3.1.2
3.1
3.2.0
3.2.1
3.2.2
3.2
3.3.0
3.3.1
3.3