Update tcp_queue_length README.md (#8386)
Update tcp_queue_length README.md (#8386)

* Update tcp_queue_length README.md

* Clarifying the metrics description

* Update README.md

* Update tcp_queue_length/README.md

Co-authored-by: cswatt <68dd74d5464d42706afe3175604ae6dd0529cacd@datadoghq.com>

Co-authored-by: cswatt <68dd74d5464d42706afe3175604ae6dd0529cacd@datadoghq.com>
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