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.

blocks/variables_dynamic.js

@@ -11,7 +11,6 @@
  * passed to defineBlocksWithJsonArray(..) must be strict JSON: double quotes
  * only, no outside references, no functions, no trailing commas, etc. The one
  * exception is end-of-line comments, which the scraper will remove.
- * @author duzc2dtw@gmail.com (Du Tian Wei)
  */
 'use strict';