[CONFIGURATION-626] Updated user guide.
[CONFIGURATION-626] Updated user guide.

The now deprecated getArray() method is no longer described.
Instead, it is mentioned that get() can handle arrays.

git-svn-id: 0d31da9e303333003508381311333cf78a25d41b@1744971 13f79535-47bb-0310-9956-ffa450edef68

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