Apply suggestions from code review

Co-authored-by: Fabien Malfoy <[email protected]>

Author: bene2k1

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

@@ -46,12 +46,12 @@ Follow these steps to enable QGA on an Instance where it is currently inactive.
 
 ### Installation
 
-Instances created from images older than March 1st, 2024, may require manual installation of the `qemu-guest-agent` package:
+Instances created from images older than March 1st, 2024 may require manual installation of the `qemu-guest-agent` package:
 
 - **Fedora / AlmaLinux / RockyLinux / CentOS**
 
   ```bash
-  # yum -y install qemu-guest-agent
+  # yum -y --best install qemu-guest-agent
   ```
 
 - **Debian / Ubuntu**