Update Upgrade.md

Upgrade.md

@@ -1,6 +1,6 @@
 # How to Upgrade 
 
-- If you are using the OMS Agent for Linux, please follow the instruction for the [OMS Agent for Linux.](http://https://docs.microsoft.com/en-us/azure/azure-monitor/agents/log-analytics-agent) 
+- If you are using the OMS Agent for Linux, please follow the instruction for the [OMS Agent for Linux.](https://github.com/Microsoft/OMS-Agent-for-Linux/blob/master/docs/OMS-Agent-for-Linux.md)
 
 - If you are using the containerized Container Solution, please go thru the following instructions: 
 	- Stop the containerized Container Solution.