Specify list results in SDK methods

[albertokarakoutev-smar]

Pull Request

Description

Some return types of the SDK methods and subsequently the public API support both a singleton item result and a list of them. This MR adds the proper notation for those methods using Union types.

Type of Change

• Bug fix
• New feature
• Documentation update
• Code refactoring
• Other (please describe):

Environment Information

• Smartsheet API Version: 2.0
• Smartsheet Python SDK Version: 3.7.1
• Python Version: 3.7

What Changes Were Made

Update the return types of the affected methods.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have updated the relevant files in docs-source/ (see Documentation guidelines)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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