doc: fix suspicious heading emphasis in n-api.md
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines
I do not know C++ and N-API domain, so I am not sure what these cases are: some accidental artifacts, intentional markdown emphasis for just these two headings or some not escaped C++ syntax. But rather than creating an issue to ask, I've decided to make a PR so that we can close it if these are not typos.
To check the rendering: napi_open_callback_scope, napi_close_callback_scope.
cc @nodejs/n-api