docs: Fixes typo in worker_threads.md
Documentation Fix in Worker Threads
This Pull Request makes a minor change in the api documentation for Worker-threads. 'port1' had been mistyped as 'port2' and has been changed accordingly.
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