Frontend Error : There's non toggle button at every piece of code in file system doc.

[DivyaRajX]

Affected URL(s)

https://nodejs.org/docs/latest/api/fs.html

Description of the problem

There's non toggle button at every piece of code in file system doc. This would be of no use if the developer has not imported the fs module in every piece of code just like in any other docs.

These are two refernces of the problem.

[juanarbol]

PRs are more than welcome :)