updates to fix issue 60

Author: georgewallace

serverless/pages/index-management.asciidoc

@@ -97,7 +97,7 @@ To view information about the stream's backing indices, click the number in the
 * To view more information about a data stream, such as its generation or its
 current index lifecycle policy, click the stream's name. From this view, you can navigate to **Discover** to
 further explore data within the data stream.
-* preview:[] To edit the data retention value, open the **Manage** menu, and then click **Edit data retention**.
+* preview:[] To modify the data retention value, select an index, open the **Manage**  menu, and click **Edit data retention**.
 
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