Reverting changes to index.html (covered in #896)

docs/index.md

@@ -5,7 +5,7 @@ title: Spark Overview
 
 Apache Spark is a fast and general-purpose cluster computing system.
 It provides high-level APIs in [Scala](scala-programming-guide.html), [Java](java-programming-guide.html), and [Python](python-programming-guide.html) that make parallel jobs easy to write, and an optimized engine that supports general computation graphs.
-It also supports a rich set of higher-level tools including [Spark SQL](sql-programming-guide.html) (SQL on Spark), [MLlib](mllib-guide.html) for machine learning, [GraphX](graphx-programming-guide.html) for graph processing, and [Spark Streaming](streaming-programming-guide.html).
+It also supports a rich set of higher-level tools including [Shark](http://shark.cs.berkeley.edu) (Hive on Spark), [MLlib](mllib-guide.html) for machine learning, [GraphX](graphx-programming-guide.html) for graph processing, and [Spark Streaming](streaming-programming-guide.html).
 
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