Update dev-tunnels-service-limits.md - active connections to 1000

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Learn Build status updates of commit c94fafd:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
includes/dev-tunnels/dev-tunnels-service-limits.md	:white_check_mark:Succeeded

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PRMerger Results

Issue	Description
File Change Percent	This PR contains file(s) with more than 30% file change.