OBSDOCS-1881 [POWERMON] Update attribute for PM Operator

Author: gwynnemonahan

_attributes/common-attributes.adoc

@@ -172,7 +172,7 @@ endif::[]
 :PM-title: power monitoring for Red Hat OpenShift
 :PM-shortname: power monitoring
 :PM-shortname-c: Power monitoring
-:PM-operator: Power monitoring Operator
+:PM-operator: Power Monitoring Operator
 :PM-kepler: Kepler
 //serverless
 :ServerlessProductName: OpenShift Serverless