Added change to changelog

Author: pi1024e

src/MarketplaceOrdering/MarketplaceOrdering/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+*Fixed documentation typo where "Azure" was all lowercase letters
 
 ## Version 1.0.0
 * General availability of `Az.MarketplaceOrdering` module