doc: improve async_hooks asynchronous context example
- use writeFile(1) everywhere to log
- prettify execution id graph
- add clearer explanation for TickObject presence
- add causation graph via triggerAsyncId
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines
/cc @nodejs/async_hooks