Term standardization: dead/down server -> down server

Hi ATS dev community, I am writing to collect feedback on PR #9582 . The Issue Issue #7283 records the issue of using dead server and down serverin the configurations interchangeably, which

Updated invitation: ATS 10 Development Meeting @ Every 2 weeks from 11am to 12pm on Tuesday from Tue Dec 5, 2023 to Tue Mar 26 (EST) (dev@trafficserver.apache.org)

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Updated invitation: ATS 10 Development Meeting @ Every 2 weeks from 11am to 12pm on Tuesday (EDT) (dev@trafficserver.apache.org)

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