IObjectSerializer fix examples.

[Rosuavio]

Change exmaples to reflect the change in the interface.
Serializes to and from objects instead of strings.

Fixes #497

Docs for Toolkit PR

CommunityToolkit/WindowsCommunityToolkit#3702

What changes to the docs does this PR provide?

Change exmaples to reflect the change in the interface.
Serializes to and from objects instead of strings.

PR Checklist

Please check if your PR fulfills the following requirements:

• Correctly picked the right branch to base the change off (dev for new features, master for typos/improvements)
• For new pages, used the provided template
• For new features, added an entry in the Table of Contents
• Ran against a spell and grammar checker
• Contains NO breaking changes

Other information

[opbld32]

Docs Build status updates of commit 427faeb:

❌ Validation status: errors

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[opbld33]

Docs Build status updates of commit 1c48beb:

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[michael-hawker]

Odd why everything is replaced in the diff here... line endings?

We should keep the System.Text.Json example too (and it seems to have the proper object interface already). It's still prevalent and should still be the first we list. We should just have 3 examples in total, right?

[Rosuavio]

Better?

[Rosuavio]

Odd why everything is replaced in the diff here... line endings?

I did not base off of master and was missing .gitconfig

[opbld31]

Docs Build status updates of commit 2348135:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/helpers/ObjectSerializer.md	✅Succeeded	View

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[opbld32]

Docs Build status updates of commit 01c5946:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/helpers/ObjectSerializer.md	✅Succeeded	View

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