Revert "[FormData] 번역 - line8(#1232)"

This reverts commit afb3928.

Author: Violet-Bora-Lee

5-network/02-formdata/article.md

@@ -5,7 +5,7 @@ This chapter is about sending HTML forms: with or without files, with additional
 
 [FormData](https://xhr.spec.whatwg.org/#interface-formdata) objects can help with that. As you might have guessed, it's the object to represent HTML form data.
 
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+The constructor is:
 ```js
 let formData = new FormData([form]);
 ```