Update ChangeLog.md

Author: mudit794

src/Advisor/Advisor/ChangeLog.md

@@ -19,7 +19,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
-* Added new category "Operational Excellence"
+* Added new category "Operational Excellence" to Get-AzAdvisorRecommendation cmdlet.
 
 ## Version 1.0.1
 * Fixed miscellaneous typos across module