Documentation page update suggestion

[Santosh Kori]

Hello Google pagespeed insight team,

I like the document very help and found one correction/ upate which i found while trying one of your javascript example mention in page  https://developers.google.com/speed/docs/insights/v5/get-started#javascript 

Javascript example containing code
lighthouse.audits['first-cpu-idle'].displayValue

where "first-cpu-idle" and "estimated-input-latency"  object responses are depreciated and need to update in this page as well. 

Reference : https://developer.chrome.com/docs/lighthouse/performance/first-cpu-idle/

Suggesting correction, so other will not face error while testing your example code.