Update devon4j DAO list example in wiki

[jan-vcapgemini]

As discussed with @hohwille
The current example: https://github.com/devonfw/devon4j/wiki/guide-dao#dao-implementation for a DAO implementation returns a full list of entities instead of a paginated list. This can result in an unnecessary strain on the server, depending on the context. This example should either be removed or be replaced with a better solution.