Merge pull request #254 from huffmanca/define_tp_attribute

Defining Tech Preview attribute.

Author: huffmanca

docs/topics/templates/document-attributes.adoc

@@ -84,6 +84,9 @@
 // URL for downloads on developers.redhat.com
 :ProductDownloadURL: https://developers.redhat.com/download-manager/file/
 
+// KBase Article links:
+:KBArticleTechnologyPreview: https://access.redhat.com/support/offerings/techpreview
+
 // *********
 // * Icons *
 // *********