Remove <div class="note"> which breaks formatting (npm#460)

* Remove <div class="note"> which broke formatting

* Update about-packages-and-modules.mdx

---------

Co-authored-by: Monish Chandra Mohan <23190045+monishcm@users.noreply.github.com>

Author: 0liver

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

@@ -48,12 +48,11 @@ To be loaded by the Node.js `require()` function, a module must be one of the fo
 * A folder with a `package.json` file containing a `"main"` field.
 * A JavaScript file.
 
-<div class="note">
+<Note>
 
-<span class="bold">**Note:** </span>
-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.
+**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.
 
-</div>
+</Note>
 
 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: