Add SUSE content for katello to Planning guide

guides/common/modules/con_defining-your-content-library.adoc

@@ -11,6 +11,12 @@ For example, {RHEL}{nbsp}Server is a product in {Project}.
 The repositories for the {RHEL}{nbsp}Server product consist of different versions, architectures, and add-ons.
 When you enable a Red{nbsp}Hat repository, {Project} automatically creates an associated product.
 
+ifdef::katello,orcharhino[]
+SUSE content::
+You can use {Project} to manage hosts running {SLES}.
+For more information, see {ContentManagementDocURL}Managing_SUSE_Content_content-management[Managing SUSE content] in _{ContentManagementDocTitle}_.
+endif::[]
+
 Other sources of content::
 To distribute content from custom sources, you must create products and repositories manually.
 You can organize other content into {customproduct}s however you want.