(doc) Remove incorrect line about extensions

The .extension file extension is a requirement when creating extension
packages. It is this file extension that causes Chocolatey CLI to
extract the files into the extensions folder, in the same way that the
.hook file extension that causes files to be extracted into the hooks
folder, and then the .template file extension that causes files to be
extracted into the templates folder.

src/content/docs/en-us/guides/create/create-extension-package.mdx

@@ -132,8 +132,6 @@ Open the `example.extension.nuspec` file in VS Code and modify the metadata as a
 
 That's all you need!
 
-You may notice that all of the example packages above end with `.extension`. This is not required for an extension package by Chocolatey itself, but it is how we easily classify extension packages on the Chocolatey Community Repository.
-
 #### Creating Your Install Script
 
 As we mentioned earlier, there's no need for an install script in an extension package - Chocolatey CLI handles putting the extension in the right place!