Property descriptions should not include defaults

- The default is properly modeled and is up to the consumer to
    choose where / when to render it fopr consistency

pmd-core/src/main/java/net/sourceforge/pmd/renderers/HTMLRenderer.java

@@ -40,7 +40,7 @@ public class HTMLRenderer extends AbstractIncrementingRenderer {
 
     public static final PropertyDescriptor<Boolean> HTML_EXTENSION =
         PropertyFactory.booleanProperty("htmlExtension")
-                       .desc("Replace file extension with .html for the links (default: false)")
+                       .desc("Replace file extension with .html for the links.")
                        // default value is false - to have the old (pre 6.23.0) behavior, this needs to be set to true.
                        .defaultValue(false)
                        .build();