Update "Manage user data folders"

[david-risney]

Rendered article section for review:

• Manage user data folders > How many UDFs are created?
  • /webview2/concepts/user-data-folder.md
  • Internal preview: https://review.learn.microsoft.com/microsoft-edge/webview2/concepts/user-data-folder?branch=pr-en-us-3369#how-many-udfs-are-created
  • External preview: https://github.com/MicrosoftDocs/edge-developer/blob/user-data-folder-doc-update/microsoft-edge/webview2/concepts/user-data-folder.md#how-many-udfs-are-created
  • Before/live: https://learn.microsoft.com/microsoft-edge/webview2/concepts/user-data-folder#how-many-udfs-are-created
  • A developer reading the UDF article noticed a section that was confusing and inaccurate. This PR addresses that.

AB#56184517

[david-risney]

To @mikehoffms comment:

pls elaborate ", only one HDESKTOP". what does "only one HDESKTOP" mean?

Maybe better to say something like 'sharing may only occur between apps on the same HDESKTOP'?

[mikehoffms]

LGTM - Writer

[learn-build-service-prod]

Learn Build status updates of commit 811529f:

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microsoft-edge/webview2/concepts/user-data-folder.md	✅Succeeded	View

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