[cleanup] Files.app: Fix the mis-styled JSdoc in function_sequence.js.

chrome/browser/resources/file_manager/js/metadata/function_sequence.js

Index: chrome/browser/resources/file_manager/js/metadata/function_sequence.js
diff --git a/chrome/browser/resources/file_manager/js/metadata/function_sequence.js b/chrome/browser/resources/file_manager/js/metadata/function_sequence.js
index 1541d638f7363f89e77ba252e3acd5c8b7e658e2..2539df3eaedc5d0743441ba225b36a7cbe09dcb1 100644
--- a/chrome/browser/resources/file_manager/js/metadata/function_sequence.js
+++ b/chrome/browser/resources/file_manager/js/metadata/function_sequence.js
@@ -8,8 +8,8 @@
  *
  * @param {Array} steps                array of functions to invoke in sequence
  * @param {Object} logger              logger
- * @param {Function} [callback]        callback to invoke on success
- * @param {Function} [failureCallback] callback to invoke on failure
+ * @param {Function} callback          callback to invoke on success
+ * @param {Function} failureCallback   callback to invoke on failure
  */
 function FunctionSequence(name, steps, logger, callback, failureCallback) {
   // Private variables hidden in closure