build: do not require class comment

Signed-off-by: Bart Jaskulski <bartek.jaskulski@wpdesk.net>

phpcs.xml.dist

@@ -50,8 +50,8 @@
         <!-- Demanding Yoda conditions is stupid. -->
         <exclude name="WordPress.PHP.YodaConditions"/>
 
-		<!-- The only required comments are for the classes. -->
 		<exclude name="Squiz.Commenting.FunctionComment"/>
+		<exclude name="Squiz.Commenting.ClassComment"/>
 		<exclude name="Generic.Commenting.DocComment.MissingShort"/>
 
 		<!-- You can use short if-else form. -->