Improve alt-text for live query stats image

Updated alt-text for the Live Query Stats image in Activity Monitor section.

Author: JamesJBarnett

docs/relational-databases/performance/live-query-statistics.md

@@ -55,7 +55,7 @@ Internally, live query statistics use the [sys.dm_exec_query_profiles](../system
 
 You can also access the live execution plan from **[Activity Monitor](../performance-monitor/activity-monitor.md)** by right-clicking any query in the **Processes** or **Active Expensive Queries** table.  
 
-:::image type="content" source="../../relational-databases/performance/media/livequerystatsactmon.png" alt-text="Live Query Stats button in Activity Monitor.":::  
+:::image type="content" source="../../relational-databases/performance/media/livequerystatsactmon.png" alt-text="Screenshot of Live Query Stats button in Activity Monitor.":::  
 
 ## Remarks
 
@@ -81,4 +81,4 @@ You must enable the statistics profile infrastructure before live query statisti
 - [sys.dm_exec_query_statistics_xml](../system-dynamic-management-views/sys-dm-exec-query-statistics-xml-transact-sql.md)
 - [sys.dm_exec_query_profiles](../system-dynamic-management-views/sys-dm-exec-query-profiles-transact-sql.md)
 - [Logical and physical showplan operator reference](../showplan-logical-and-physical-operators-reference.md)
-- [Query Profiling Infrastructure](query-profiling-infrastructure.md)
+- [Query Profiling Infrastructure](query-profiling-infrastructure.md)