Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=55383
Improve HTML markup of "sample" webb application.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1529678 13f79535-47bb-0310-9956-ffa450edef68
Follow-Up to r1529678:
Replace tabs with spaces.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1529680 13f79535-47bb-0310-9956-ffa450edef68
Update web.xml of "sample" web application to Servlet 3.1.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1529681 13f79535-47bb-0310-9956-ffa450edef68
Update remaining XML files with "ISO-8859-1" encoding in the "docs" webapp to the XML-default encoding "UTF-8".

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1529687 13f79535-47bb-0310-9956-ffa450edef68