7009422: Two dead links in Swing API documentation

Reviewed-by: darcy, art

src/share/classes/java/awt/Component.java

@@ -5795,7 +5795,7 @@ public abstract class Component implements ImageObserver, MenuContainer,
      * <code>InputMethodRequests</code> instance.
      * If listener <code>l</code> is <code>null</code>,
      * no exception is thrown and no action is performed.
-     * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
+     * <p>Refer to <a href="{@docRoot}/java/awt/doc-files/AWTThreadIssues.html#ListenersThreads"
      * >AWT Threading Issues</a> for details on AWT's threading model.
      *
      * @param    l   the input method listener

src/share/classes/java/lang/CharSequence.java

@@ -66,7 +66,7 @@ public interface CharSequence {
      * indexing. </p>
      *
      * <p>If the <code>char</code> value specified by the index is a
-     * <a href="Character.html#unicode">surrogate</a>, the surrogate
+     * <a href="{@docRoot}/java/lang/Character.html#unicode">surrogate</a>, the surrogate
      * value is returned.
      *
      * @param   index   the index of the <code>char</code> value to be returned