Update compute/instances/reference-content/understanding-qemu-guest-agent.mdx

Co-authored-by: Jessica <[email protected]>

Author: bene2k1

compute/instances/reference-content/understanding-qemu-guest-agent.mdx

@@ -40,7 +40,7 @@ To verify that QGA is running on your Instance, use the following command:
 
 If the output is `active`, QGA is running, and you are ready to benefit from the associated features. If the output is `inactive`, you may need to install and/or activate QGA.
 
-## Opting In
+## Opting in
 
 Follow these steps to enable QGA on an Instance where it is currently inactive.