Add disclaimer to docs: Cloudera-specific info still present.

While we are working on excising it, we don't want users to be
confused about what the manual is intended to describe.

Change-Id: I7740189fd7ff7f22d8471f037e190d9923521936
Reviewed-on: http://gerrit.cloudera.org:8080/5610
Reviewed-by: Tim Armstrong <tarmstrong@cloudera.com>
Tested-by: Impala Public Jenkins
diff --git a/docs/topics/impala_intro.xml b/docs/topics/impala_intro.xml
index aef7565..0407333 100644
--- a/docs/topics/impala_intro.xml
+++ b/docs/topics/impala_intro.xml
@@ -52,7 +52,10 @@
       <note>
         Impala was accepted into the Apache incubator on December 2, 2015.
         In places where the documentation formerly referred to <q>Cloudera Impala</q>,
-        now the official name is <q>Apache Impala (incubating)</q>.
+        now the official name is <q>Apache Impala (incubating)</q>. As of January 2016,
+        the Impala community is working on excising the Cloudera-specific documentation
+        from this manual. While that is ongoing, there are still some outdated or
+        off-topic parts of this manual.
       </note>
 
   </conbody>