Add new attributes

Author: xenolinux

_attributes/common-attributes.adoc

@@ -318,4 +318,10 @@ endif::[]
 :cap-oci-short: Cluster API Provider OCI
 // Cluster API Provider VMware vSphere
 :cap-vsphere-first: Cluster API Provider VMware vSphere
-:cap-vsphere-short: Cluster API Provider vSphere
+:cap-vsphere-short: Cluster API Provider vSphere
+
+// Hosted control planes related attributes
+:mce-first: multicluster engine for Kubernetes operator (MCE)
+:mce-short: MCE
+:hcp-capital: Hosted control planes
+:hcp: hosted control planes