Fix capitalization in Event Grid namespace header

Author: denrea

articles/reliability/reliability-event-grid.md

@@ -71,7 +71,7 @@ The following table illustrates the client-side failover and geo disaster recove
 | Namespaces          | Supported                                 | Not supported                         |
 
 
-### Event grid namespace
+### Event Grid namespace
 
 Event Grid namespace doesn't support cross-region DR. However, you can achieve cross region high availability through client-side failover implementation by creating primary and secondary namespaces.