Fixed typo in Overview docs.
@@ -20,7 +20,7 @@ Apache NiFi Team <dev@nifi.apache.org>
:linkattrs:
== What is Apache NiFi?
-Put simply NiFi was built to automate the flow of data between systems. While
+Put simply, NiFi was built to automate the flow of data between systems. While
the term 'dataflow' is used in a variety of contexts, we use it here
to mean the automated and managed flow of information between systems. This
problem space has been around ever since enterprises had more than one system,
