Update how-to-configure-connection-monitor.md

[Narthring]

Fixed Powershell script error

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[Copilot]

Pull Request Overview

Fixed a PowerShell script error in the ExpressRoute connection monitor configuration documentation by removing an incomplete line that was causing syntax issues.

• Removed an incomplete variable assignment line that was missing its value assignment

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[v-dirichards]

@duongau

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.

#label:"aq-pr-triaged"
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