Add log level list to helm values docs
[#17084135](https://www.pivotaltracker.com/story/show/170841351)
@@ -25,7 +25,7 @@ image:
# tag of the operator docker image
tag: foobar
-# logLevel defines from which level the logs should be printed.
+# logLevel defines from which level the logs should be printed (trace,debug,info,warn).
logLevel: debug
# workers are the int values for running maximum number of workers of the respective controller.
