docs(windows): Fix bug in next() method of onboarding example

[dakshshah96]

Description

The current example code for the onboarding example on the Windows component doesn't work as expected.

Motivation and Context

This PR fixes the example code so that it works as expected.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

Checklist:

• The PR title is no longer than 64 characters.
• The PR is submitted to the correct branch (master for bug fixes and documentation updates, dev for new features and breaking changes).
• My code follows the code style of this project.
• I've added relevant changes to the documentation (applies to new features and breaking changes in core library)

[MajesticPotatoe]

Thank you for your contribution 👍

[lock]

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