Fix rst document file format issue


Issue-ID: DCAEGEN2-558

Change-Id: Id7e0fb437f9e93e611478e43c94d9e6ba3eeadfe
Signed-off-by: Guobiao Mo <guobiaomo@chinamobile.com>
diff --git a/docs/sections/installation_oom.rst b/docs/sections/installation_oom.rst
index 878214e..717dbbc 100644
--- a/docs/sections/installation_oom.rst
+++ b/docs/sections/installation_oom.rst
@@ -32,6 +32,7 @@
 * charts: subdirectory for sub-charts.
 
 The dcaegen2 chart has the following sub-charts:
+
 * dcae-bootstrap: a Kubernetes job that deploys additional DCAE components;
 * dcae-cloudify-manager: a Kubernetes deployment of a Cloudify Manager;
 * dcae-healthcheck: a Kubernetes deployment that provides a DCAE health check API;