remove unnecessary comment

Author: labrenbe

tests/templates/kuttl/opensearch-dashboards/10-assert.yaml.j2

@@ -1,6 +1,3 @@
-# All fields are checked that are set by the operator.
-# This helps to detect unintentional changes. It is also a good reference for the output of the
-# operator. The maintenance effort should be okay as long as it is only done in the smoke test.
 ---
 apiVersion: kuttl.dev/v1beta1
 kind: TestAssert