8174696: Fix @since in module-info.java in dev/jaxp repo

Reviewed-by: alanb

jaxp/src/java.xml/share/classes/module-info.java

@@ -26,6 +26,8 @@
 /**
  * Defines the Java API for XML Processing (JAXP), the Streaming API for XML (StAX),
  * the Simple API for XML (SAX), and the W3C Document Object Model (DOM) API.
+ *
+ * @since 9
  */
 module java.xml {
     exports javax.xml;