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.

generators/dart/colour.js

@@ -6,7 +6,6 @@
 
 /**
  * @fileoverview Generating Dart for colour blocks.
- * @author fraser@google.com (Neil Fraser)
  */
 'use strict';
 

generators/dart/lists.js

@@ -6,7 +6,6 @@
 
 /**
  * @fileoverview Generating Dart for list blocks.
- * @author fraser@google.com (Neil Fraser)
  */
 'use strict';
 

generators/dart/logic.js

@@ -6,7 +6,6 @@
 
 /**
  * @fileoverview Generating Dart for logic blocks.
- * @author q.neutron@gmail.com (Quynh Neutron)
  */
 'use strict';
 

generators/dart/loops.js

@@ -6,7 +6,6 @@
 
 /**
  * @fileoverview Generating Dart for loop blocks.
- * @author fraser@google.com (Neil Fraser)
  */
 'use strict';
 

generators/dart/math.js

@@ -6,7 +6,6 @@
 
 /**
  * @fileoverview Generating Dart for math blocks.
- * @author q.neutron@gmail.com (Quynh Neutron)
  */
 'use strict';
 

generators/dart/procedures.js

@@ -6,7 +6,6 @@
 
 /**
  * @fileoverview Generating Dart for procedure blocks.
- * @author fraser@google.com (Neil Fraser)
  */
 'use strict';
 

generators/dart/text.js

@@ -6,7 +6,6 @@
 
 /**
  * @fileoverview Generating Dart for text blocks.
- * @author fraser@google.com (Neil Fraser)
  */
 'use strict';
 

generators/dart/variables.js

@@ -6,7 +6,6 @@
 
 /**
  * @fileoverview Generating Dart for variable blocks.
- * @author fraser@google.com (Neil Fraser)
  */
 'use strict';
 

generators/dart/variables_dynamic.js

@@ -6,7 +6,6 @@
 
 /**
  * @fileoverview Generating Dart for dynamic variable blocks.
- * @author fenichel@google.com (Rachel Fenichel)
  */
 'use strict';