Fix typo

python -> Python

Author: changeworld

articles/virtual-machines/extensions/stackify-retrace-linux.md

@@ -179,7 +179,7 @@ az vm extension set --publisher 'Stackify.LinuxAgent.Extension' --version 1.0 --
 | Error code | Meaning | Possible action |
 | :---: | --- | --- |
 | 10 | Install Error | wget is required |
-| 20 | Install Error | python is required |
+| 20 | Install Error | Python is required |
 | 30 | Install Error | sudo is required |
 | 40 | Install Error | activationKey is required |
 | 51 | Install Error | OS distro not supported |