Comply with DITA - role abstract

Author: Lennonka

guides/common/modules/con_content-types-in-project.adoc

@@ -3,6 +3,7 @@
 [id="Content_Types_in_{ProjectNameID}_{context}"]
 = Content types in {ProjectName}
 
+[role="_abstract"]
 With {ProjectName}, you can import and manage many content types.
 ifdef::satellite[]
 You can use Red{nbsp}Hat content as well as custom content and organize it into {Project} products.

guides/common/modules/con_introduction-to-content-management.adoc

@@ -3,6 +3,7 @@
 [id="Introduction_to_Content_Management_{context}"]
 = Introduction to content management
 
+[role="_abstract"]
 In the context of {Project}, _content_ is defined as the software installed on systems.
 This includes, but is not limited to, the base operating system, middleware services, and end-user applications.
 ifdef::satellite[]