Reference for...of statement before usage in example (#24715)

* Reference for...of statement before usage in example

The 'Showing file(s) size' example includes a for...of statement to iterate through the file array. However, this has not been introduced previously in the page (instead a for loop with an iteration variable was used just above). To prevent potential confusion, this change mentions the for...of statement and gives a snippet of how to use it before it's referenced.

Alternatively, I'd suggest changing the 'Showing file(s) size' example to use a for loop with an iteration variable for consistency.

* Remove file iteration examples

Readers will be familiar with looping through arrays, so the `for (;;)` and `for...of` snippets are not required.

files/en-us/web/api/file_api/using_files_from_web_applications/index.md

@@ -46,16 +46,7 @@ The {{DOMxRef("FileList")}} object provided by the DOM lists all of the files se
 const numFiles = fileList.length;
 ```
 
-Individual {{DOMxRef("File")}} objects can be retrieved by accessing the list as an array:
-
-```js
-for (let i = 0, numFiles = fileList.length; i < numFiles; i++) {
-  const file = fileList[i];
-  // …
-}
-```
-
-This loop iterates over all the files in the file list.
+Individual {{DOMxRef("File")}} objects can be retrieved by accessing the list as an array.
 
 There are three attributes provided by the {{DOMxRef("File")}} object that contain useful information about the file.