Comments may not appear after statements

Today i was just playing with code-sniffer.
I have found issue like

 Comments may not appear after statements 

How can you remove this ?

'#required' => FALSE // handled by JavaScript validator

This is the main culprit.
Use following code instead of this

// Handled by JavaScript validator.
     '#required' => FALSE, 

Results

Non-header or in-line comments are strongly encouraged. A general rule of thumb is that if you look at a section of code and think "Wow, I don't want to try and describe that", you need to comment it before you forget how it works. Comments should be on a separate line immediately before the code line or block they reference.

Source --- https://www.drupal.org/node/1354#inline