http2: fix [kInspect]() output for Http2Stream
This fixes a typo in the util.inspect output of Http2Stream. It previously had writeableSate instead of writableState.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
http2