Remove @author tags (#5601)

Our files are up to a decade old, and have churned so much, that the initial author of the file no longer has much meaning.

Furthermore, this will encourage developers to post to the developer group, rather than emailing Googlers (usually me) directly.

core/field_multilineinput.js

@@ -6,9 +6,6 @@
 
 /**
  * @fileoverview Text Area field.
- * @author fraser@google.com (Neil Fraser)
- * @author Andrew Mee
- * @author acbart@udel.edu (Austin Cory Bart)
  */
 'use strict';