Provide locations for updating settings

[taylorkline]

Instructs user where to update setttings.json for folder, workspace, and/or global where relevant.

The current instructions were quite vague:

To specify a subfolder in which the react-native project is located, set react-native-tools.projectRoot. You can use either an absolute or relative path here

I though this needed to be in a file named react-native-tools.projectRoot but wherever I placed it, it had no effect.

With these jsonc comments we can tell the user that these are blocks of code to add to the appropriate settings.json.

[JiglioNero]

Hi @taylorkline, and thank you for contributing. Yes, some instructions don't specify what is related to settings.json. But I think that it is possible to specify it in the explanation before the corresponding pieces of JSON. For example:
There are also some global extension technical logs that might be exposed to the output. To see them, set the following properties in the settings.json file: ...
As for clarifying where the settings.json file is located - I'm not sure if this is necessary, because there is a UI representation of the VS Code settings with the possibility of separate workspace settings:

[taylorkline]

@JiglioNero Updated based on your feedback!

[Samriel]

@taylorkline, sorry we kept you waiting and thanks for contributing to the project!