doc: clarify that the node.js irc channel is not under tsc oversight
Checklist
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documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc
Description of change
There has been some question about whether the #node.js irc channel falls under the TSC oversight or not.
See: https://github.com/nodejs/node/issues/7746
This clarifies that the #node.js irc channel is a community provided resource that is not currently directly under the oversight of the TSC/CTC.
/cc @nodejs/tsc @nodejs/ctc