Merge pull request #1719 from PiJoCoder/patch-9

Adding a link to Slow I/O t-shooting

Author: Jak-MS

docs/relational-databases/performance-monitor/monitor-disk-usage.md

@@ -35,6 +35,8 @@ manager: craigg
 
 -   Isolating Disk Activity That [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] Creates  
 
- For more information see, [Monitoring Disk Usage](https://social.technet.microsoft.com/wiki/contents/articles/monitoring-disk-usage.aspx)  
+ For more information, see [Monitoring Disk Usage](https://social.technet.microsoft.com/wiki/contents/articles/monitoring-disk-usage.aspx). 
+ 
+ For more information on how to troubleshoot I/O issues in SQL Server, see [Slow I/O - SQL Server and disk I/O performance](https://techcommunity.microsoft.com/t5/SQL-Server-Support/Slow-I-O-SQL-Server-and-disk-I-O-performance/ba-p/333983).