8309884: missing @SInCE tags in com.sun.source.*

Reviewed-by: darcy

Author: jonathan-gibbons

src/jdk.compiler/share/classes/com/sun/source/tree/DirectiveTree.java

@@ -27,5 +27,7 @@
 
 /**
  * A super-type for all the directives in a ModuleTree.
+ *
+ * @since 9
  */
 public interface DirectiveTree extends Tree { }

src/jdk.compiler/share/classes/com/sun/source/tree/LambdaExpressionTree.java

@@ -36,6 +36,8 @@
  *   (List<String> ls)->ls.size()
  *   (x,y)-> { return x + y; }
  * }</pre>
+ *
+ * @since 1.8
  */
 public interface LambdaExpressionTree extends ExpressionTree {
 

src/jdk.compiler/share/classes/com/sun/source/tree/StringTemplateTree.java

@@ -32,6 +32,7 @@
 /**
  * A tree node for a string template expression.
  *
+ * @since 21
  */
 @PreviewFeature(feature=PreviewFeature.Feature.STRING_TEMPLATES, reflective=true)
 public interface StringTemplateTree extends ExpressionTree {

src/jdk.compiler/share/classes/com/sun/source/util/Trees.java

@@ -50,6 +50,8 @@
  * Bridges JSR 199, JSR 269, and the Tree API.
  *
  * @author Peter von der Ahé
+ *
+ * @since 1.6
  */
 public abstract class Trees {
     /**