Harmonize notation of admonition blocks in documentation

There were several different notations used for NOTE and IMPORTANT
sections that sometimes didn't even render correctly.

Change-Id: I744cb0922f4bb4c99282984a487761f2c1bd6d4a
Signed-off-by: Michael Ochmann <michael.ochmann@sap.com>
diff --git a/Documentation/config-labels.txt b/Documentation/config-labels.txt
index 447caf9..1f9dd33 100644
--- a/Documentation/config-labels.txt
+++ b/Documentation/config-labels.txt
@@ -332,7 +332,8 @@
 Then *only* changes in above branch scope of parent project and child
 projects will be affected by `Video-Qualify`.
 
-NOTE: The `branch` is independent from the branch scope defined in `access`
+[NOTE]
+The `branch` is independent from the branch scope defined in `access`
 parts in `project.config` file. That means from the UI a user can always
 assign permissions for that label on a branch, but this permission is then
 ignored if the label doesn't apply for that branch.