doc: keepAliveMsecs refers to an initial delay not interval
To bring the http docs in-line with the net docs, keepAliveMsecs
should refer to the initial delay, rather than an interval between
keep alive probes.
There is currently no way to set the actual interval between keep alive probes.
Checklist
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documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc