updating the header for documentation

documentation/index.md

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-title: GitHub Repositories
+title: Documentation 
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 The Crail I/O stack consists of a set of components. Typically only a subset of the components are required for a particular use case (e.g., Spark, Hadoop, Hive, etc.) or hardware setup (e.g., RDMA, TCP, Flash, etc.). Here is a list of the components together with their GitHub repository.