Add comments / documentation links to values files
Split from #1065 (closed)
Add documentation links and comments to various values.yaml
throughout the charts.
This task is low priority, as by the time someone is looking at those particular values files, they are likely doing development work on the chart. Having comments in there to describe what the setting does is useful, but we should keep them light, similar to the omnibus attributes files
See !630 (merged) as an example of minimal additions.