Suppress 'no @return' javadoc warning

Generating ...avadoc/com/google/gerrit/launcher/GerritLauncher.html...
...google/gerrit/launcher/GerritLauncher.java:580: warning: no @return
  public static Path getDeveloperEclipseOut() throws ...
                     ^
...google/gerrit/launcher/GerritLauncher.java:589: warning: no @return
  public static Path getDeveloperBuckOut() throws ...
                     ^

Change-Id: Ide5877d08687c42a65a5563514433fbdcb3ce5f6
diff --git a/gerrit-launcher/src/main/java/com/google/gerrit/launcher/GerritLauncher.java b/gerrit-launcher/src/main/java/com/google/gerrit/launcher/GerritLauncher.java
index a272864..27f885d 100644
--- a/gerrit-launcher/src/main/java/com/google/gerrit/launcher/GerritLauncher.java
+++ b/gerrit-launcher/src/main/java/com/google/gerrit/launcher/GerritLauncher.java
@@ -615,6 +615,7 @@
   /**
    * Locate the path of the {@code eclipse-out} directory in a source tree.
    *
+   * @return local path of the {@code eclipse-out} directory in a source tree.
    * @throws FileNotFoundException if the directory cannot be found.
    */
   public static Path getDeveloperEclipseOut() throws FileNotFoundException {
@@ -624,6 +625,7 @@
   /**
    * Locate the path of the {@code buck-out} directory in a source tree.
    *
+   * @return local path of the {@code buck-out} directory in a source tree.
    * @throws FileNotFoundException if the directory cannot be found.
    */
   public static Path getDeveloperBuckOut() throws FileNotFoundException {