Update winrt-js-conversion.md for out array params

[srwei]

Update winrt js conversion doc to include:

• out array parameter information
• host objects properties when passing to host (shouldSerializeDates and shouldPassTypedArraysAsArrays)

AB#51407470

[learn-build-service-prod[bot]]

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[learn-build-service-prod[bot]]

Learn Build status updates of commit 2201d1e:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
microsoft-edge/webview2/how-to/winrt-js-conversion.md	:white_check_mark:Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel