[core] Unify javadoc for InternalApiBridge classes

Refs #4348

pmd-visualforce/src/main/java/net/sourceforge/pmd/lang/vf/ast/InternalApiBridge.java

@@ -8,14 +8,19 @@ import net.sourceforge.pmd.annotation.InternalApi;
 import net.sourceforge.pmd.lang.vf.DataType;
 
 /**
- * This is internal API, and can be changed at any time.
+ * Internal API.
+ *
+ * <p>Acts as a bridge between outer parts of PMD and the restricted access
+ * internal API of this package.
+ *
+ * <p><b>None of this is published API, and compatibility can be broken anytime!</b>
+ * Use this only at your own risk.
+ *
+ * @apiNote Internal API
  */
 @InternalApi
 public final class InternalApiBridge {
-
-    private InternalApiBridge() {
-        // utility class
-    }
+    private InternalApiBridge() {}
 
     public static void setDataType(VfTypedNode node, DataType dataType) {
         ((AbstractVFDataNode) node).setDataType(dataType);