doc: replace outdated util.promisify
timer examples with references to new awaitable timers
#39164
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Since the new awaitable timers graduated in 16.0.0, the references to using
util.promisify
to promisify the callback versions ofsetTimeout()
,setImmediate()
, etc, are confusing and likely outdated.This PR removes the
util.promisify
code samples and links to thetimers/promises
variants instead.Furthermore, it adds a link to the async iterator version of
setInterval()
in the respective docs for the callback-based version.