docs: add import syntax with module example (#1831)

Specify `import` alongside `require()` syntax

Author: anthumchris

content/packages-and-modules/introduction-to-packages-and-modules/about-packages-and-modules.mdx

@@ -43,13 +43,22 @@ Installing any package directly from git will not install [git submodules](https
 
 ## About modules
 
-A **module** is any file or directory in the `node_modules` directory that can be loaded by the Node.js `require()` function.
+A **module** is any file or directory in the `node_modules` directory that can be loaded by the Node.js `require()` or `import` syntax.
 
 To be loaded by the Node.js `require()` function, a module must be one of the following:
 
 - A folder with a `package.json` file containing a `"main"` field.
 - A JavaScript file.
 
+To use the `import` syntax, a module should also include `"type": "module"` in its `package.json` file:
+
+```json
+{
+  "name": "my-package",
+  "type": "module"
+}
+```
+
 <Note>
 
 **Note:** Since modules are not required to have a `package.json` file, not all modules are packages. Only modules that have a `package.json` file are also packages.
@@ -59,7 +68,7 @@ To be loaded by the Node.js `require()` function, a module must be one of the fo
 In the context of a Node program, the `module` is also the thing that was loaded _from_ a file. For example, in the following program:
 
 ```
-var req = require('request')
+const req = require('request')
 ```
 
 The `req` variable refers to the `request` module returned by the `require()` function.