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 [Bug report]: some API website links are not working #235

How Has This Been Tested?

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

[codecov]

Codecov Report

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

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #343   +/-   ##
=======================================
  Coverage   97.60%   97.60%           
=======================================
  Files          62       62           
  Lines        1249     1249           
  Branches       18       18           
=======================================
  Hits         1219     1219           
  Misses         30       30           

Flag	Coverage Δ
spark-2.4.x	94.66% <ø> (ø)
spark-3.0.x	96.74% <ø> (ø)
spark-3.1.x	97.48% <ø> (ø)
spark-3.2.x	97.70% <ø> (ø)
spark-3.3.x	97.70% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
core/src/main/scala/doric/sem/JoinOps.scala	100.00% <ø> (ø)
...c/main/scala/doric/syntax/AggregationColumns.scala	100.00% <ø> (ø)
...ore/src/main/scala/doric/syntax/ArrayColumns.scala	100.00% <ø> (ø)
...re/src/main/scala/doric/syntax/BinaryColumns.scala	100.00% <ø> (ø)
...e/src/main/scala/doric/syntax/BooleanColumns.scala	100.00% <ø> (ø)
...re/src/main/scala/doric/syntax/CommonColumns.scala	100.00% <ø> (ø)
...rc/main/scala/doric/syntax/ControlStructures.scala	100.00% <ø> (ø)
core/src/main/scala/doric/syntax/DStructs.scala	100.00% <ø> (ø)
core/src/main/scala/doric/syntax/DateColumns.scala	100.00% <ø> (ø)
...c/main/scala/doric/syntax/LiteralConversions.scala	100.00% <ø> (ø)
... and 13 more

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[github-actions]

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 : a463104 feat: [+] issue [Bug report]: some API website links are not working #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 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