Add @since marker to ServletResponse.setContentLengthLong() method.
It is since Servlet 3.1 (Tomcat 8 and later).

Merged r1647655 from tomcat/trunk.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc8.0.x/trunk@1647657 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/java/javax/servlet/ServletResponse.java b/java/javax/servlet/ServletResponse.java
index 2dfe95f..538f767 100644
--- a/java/javax/servlet/ServletResponse.java
+++ b/java/javax/servlet/ServletResponse.java
@@ -179,6 +179,8 @@
      * @param length
      *            an integer specifying the length of the content being returned
      *            to the client; sets the Content-Length header
+     *
+     * @since Servlet 3.1
      */
     public void setContentLengthLong(long length);
 
diff --git a/java/javax/servlet/ServletResponseWrapper.java b/java/javax/servlet/ServletResponseWrapper.java
index 3b244fd..ffb48b4 100644
--- a/java/javax/servlet/ServletResponseWrapper.java
+++ b/java/javax/servlet/ServletResponseWrapper.java
@@ -119,8 +119,10 @@
     }
 
     /**
-     * The default behavior of this method is to call setContentLength(long len)
+     * The default behavior of this method is to call setContentLengthLong(long len)
      * on the wrapped response object.
+     *
+     * @since Servlet 3.1
      */
     @Override
     public void setContentLengthLong(long length) {