8174695: Fix @since in module-info.java in dev/langtools repo

Reviewed-by: mcimadamore

langtools/src/java.compiler/share/classes/module-info.java

@@ -29,6 +29,8 @@
   * These APIs model declarations and types of the Java programming language,
   * and define interfaces for tools such as compilers which can be invoked
   * from a program.
+  *
+  * @since 9
   */
 module java.compiler {
     exports javax.annotation.processing;

langtools/src/jdk.compiler/share/classes/module-info.java

@@ -26,6 +26,8 @@
 /** Defines the implementation of the
  *  {@link javax.tools.ToolProvider#getSystemJavaCompiler system Java compiler}
  *  and its command line equivalent, <em>javac</em>, as well as <em>javah</em>.
+ *
+ *  @since 9
  */
 module jdk.compiler {
     requires transitive java.compiler;

langtools/src/jdk.javadoc/share/classes/module-info.java

@@ -26,6 +26,8 @@
 /** Defines the implementation of the
  *  {@link javax.tools.ToolProvider#getSystemDocumentationTool system documentation tool}
  *  and its command line equivalent, <em>javadoc</em>.
+ *
+ *  @since 9
  */
 module jdk.javadoc {
     requires transitive java.compiler;

langtools/src/jdk.jdeps/share/classes/module-info.java

@@ -25,6 +25,8 @@
 
 /** Defines tools for analysing dependencies in Java libraries and programs, including
  *  the <em>jdeps</em> and <em>javap</em> tools.
+ *
+ *  @since 9
  */
 module jdk.jdeps {
     requires java.base;