Update session-host-update-configure.md

[kyjones03]

Added the RBAC role pre-requisite description for the virtual network as it's not included prior.

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Learn Build status updates of commit 7eb1682:

:warning: Validation status: warnings

File	Status	Preview URL	Details
articles/virtual-desktop/session-host-update-configure.md	:warning:Warning		Details

articles/virtual-desktop/session-host-update-configure.md

• Line 39, Column 58: [Warning: hard-coded-locale - See documentation] Link 'https://learn.microsoft.com/en-us/azure/role-based-access-control/built-in-roles/networking#network-contributor' contains locale code 'en-us'. For localizability, remove 'en-us' from links to most Microsoft sites.
• Line 39, Column 58: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/en-us/azure/role-based-access-control/built-in-roles/networking#network-contributor' will be broken in isolated environments. Replace with a relative link.

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[Court72]

@dknappettmsft

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

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