Use Include for All Samples in Documentation

[rwinch]

We should use include-code for all samples within the documentation. This will allow us to test the sample code to ensure that it works.

If you are wanting to contribute to this issue, please:

• Select a single adoc page that you will work on
• Check to see that it isn't already being worked on
• Create a sub-issue for the adoc page you are going to work on
• Submit a pull request to the 6.5.x branch with the changes using 6eee256 as a guide to how to make the changes
  • However, please make the changes to the entire adoc page in a single commit / PR.
  • Consider adding tests if it makes sense

[christophsj]

Hi! I am a spring security user and I would love to contribute.

However, I do not seem to be able to create a sub issue. I am a first time contributor, is this expected?