Fix doc build warnings

Issue-ID: DCAEGEN2-516
Change-Id: I94f1c7fcf5e4a21752c3ce9d8d71d98f2140e1ee
Signed-off-by: Lusheng Ji <lji@research.att.com>
diff --git a/docs/sections/blueprints/cdap.rst b/docs/sections/blueprints/cdap.rst
index 9dd3bd8..cff2561 100644
--- a/docs/sections/blueprints/cdap.rst
+++ b/docs/sections/blueprints/cdap.rst
@@ -12,7 +12,7 @@
 will be the CDAP master.
 
 Blueprint Input Parameters
----------------------
+--------------------------
 
 This blueprint has the following required input parameters: