Fix broken JavaRS link (#41)

(cherry picked from commit 487c31d)

Author: jordan-smith721

source/index.txt

@@ -54,7 +54,7 @@ runnable project by following the :ref:`scala-quickstart` guide.
 To access MongoDB by using Java instead of Scala, use the `Java Sync
 Driver <https://www.mongodb.com/docs/drivers/java/sync/current/>`__ or
 the asynchronous `Java Reactive Streams Driver
-<https://www.mongodb.com/docs/languages/java/drivers/java-rs/current/>`__.
+<https://www.mongodb.com/docs/languages/java/reactive-streams-driver/current/>`__.
 
 Compatibility
 -------------