Add comments for Maven snippet plugin and remove spurious newlines per WW-2658. Thanks to Matthieu Chase Heimer for the patch.

Files:
modified: /struts/struts2/trunk/apps/showcase/src/main/java/org/apache/struts2/showcase/fileupload/MultipleFileUploadUsingListAction.java (try)
modified: /struts/struts2/trunk/apps/showcase/src/main/java/org/apache/struts2/showcase/fileupload/MultipleFileUploadUsingArrayAction.java (try)