Turn code block into example

• Make it an example and add desc.
• Fix table; was not rendered properly

doc.zih.tu-dresden.de/docs/contrib/content_rules.md

@@ -7,7 +7,7 @@
 ## Motivation and Rationale
 
 This page holds rules regarding the layout, content, and writing of this
-documentation. The goals are to provide a comprehensive, consistent, up-to-date and well-written
+documentation. The goals are to provide a comprehensive, consistent and well-written
 documentation that is pure joy to read and use. It shall help to find answers and provide knowledge
 instead of being the bottleneck and a great annoyance. Therefore, we set up some rules which
 are outlined in the following.