Updated user's guide related to changes on BeanHelper.
Updated user's guide related to changes on BeanHelper.

Since BeanHelper is no longer a static utility class, its usage patterns have
changed. This has to be reflected in the examples and descriptions provided by
the user's guide.

git-svn-id: 0d31da9e303333003508381311333cf78a25d41b@1520799 13f79535-47bb-0310-9956-ffa450edef68

mohanaraosv/commons-configuration,apache/commons-configuration,apache/commons-configuration,mohanaraosv/commons-configuration,apache/commons-configuration,mohanaraosv/commons-configuration