Update comment about flink.ci.license.suffix

pom.xml

@@ -66,7 +66,8 @@ under the License.
         <jackson.version>2.15.3</jackson.version>
         <guava.version>32.1.3-jre</guava.version>
         <flink.markBundledAsOptional>true</flink.markBundledAsOptional>
-        <!-- The license check requires the artifactId to match the directory that the module resides in.
+        <!-- The license check and the optional shade check
+             require the artifactId to match the directory that the module resides in.
              This is not the case for several modules in flink-shaded for legacy reasons.
              This property can be used by modules to add a suffix to the artifactId to match the directory name on CI
              when the 'license-check' profile is active. -->