Wrong file suffix in New Project section documentation

[mrkrizic]

The New Project documentation on the website https://rescript-lang.org/docs/manual/v11.0.0/installation#prerequisites is not up to date.

The demo project is using the res.mjs, since it is now using esmodule. The documentation is still mentioning res.js.

So instead of running the command:
node src/Demo.res.js

You will actually need to use this command instead:
node src/Demo.res.mjs

It is a minor issue, but it is crucial for people starting out with the language that the introduction is well documented and correct.

[fhammerschmidt]

Good catch and I agree!