Add short DPH section to users guide

MERGE TO 6.10

diff --git a/docs/users_guide/parallel.xml b/docs/users_guide/parallel.xml
index 96e4e56..76d38dc 100644 (file)
--- a/docs/users_guide/parallel.xml
+++ b/docs/users_guide/parallel.xml
@@ -169,6 +169,14 @@ nfib n | n <= 1 = 1
       parallel <literal>map</literal>.</para>
   </sect2>
 
+<sect2><title>Data Parallel Haskell</title>
+  <para>GHC includes experimental support for Data Parallel Haskell (DPH). This code
+        is highly unstable and is only provided as a technology preview. More
+        information can be found on the corresponding <ulink
+        url="http://www.haskell.org/haskellwiki/GHC/Data_Parallel_Haskell">DPH
+        wiki page</ulink>.</para>
+</sect2>
+
 </sect1>
 
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