modules documentation didn't have correct import example

[miccou]

What does this PR do?

• Documentation or TypeScript types (it's okay to leave the rest blank in this case)
• Code changes

I noticed that the modules documentation doesn't include import example code in the imports section.

This PR replaces the screenshotted code block with:

import { foo } from "./foo"; // extensions are optional
import bar from "./bar.ts";
import { stuff } from "./my-commonjs.cjs";

[colinhacks]

Oops. Thanks!