Fix typo in 'Update history' section header

Author: przlplx

support/windows-server/high-availability/troubleshoot-rolling-upgrades.md

@@ -207,7 +207,7 @@ Get-ClusterLog -TimeSpan 24:00 -Destination
     
 ```
 
-**Uupdate history**
+**Update history**
 
 ```powershell