selectCheckboxMenu Component header corrected

git-svn-id: http://primefaces.googlecode.com/svn/examples/trunk/showcase@10885 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Sample update

git-svn-id: http://primefaces.googlecode.com/svn/examples/trunk/showcase@10887 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c