Improve docs on passing args to node process

`func start` with `-- "--prof"` seems to do nothing. I, at least, can't find the resulting *.log file anywhere on my system.

Adding `--prof` to `NODE_OPTIONS` in `local.settings.json` results in an error message.

Relevant output snippet:

```sh
Azure Functions Core Tools
Core Tools Version: 4.0.4865 Commit hash: N/A (64-bit)
Function Runtime Version: 4.12.2.19454

[2022-12-01T13:39:27.380Z] Language Worker Process exited. Pid=14562.
[2022-12-01T13:39:27.380Z] node exited with code 9 (0x9). .
[2022-12-01T13:39:27.390Z] node: --prof is not allowed in NODE_OPTIONS
```

Easy profiling of Node.js apps (https://nodejs.org/en/docs/guides/simple-profiling/) seems impossible, unless I'm missing something.

Please allow us to profile Node.js apps run with `func start`.