GH#35319: Added unit in the VM memory overhead equation

Author: Shikha Jhala

modules/virt-cluster-resource-requirements.adoc

@@ -35,7 +35,7 @@ Additionally, {VirtProductName} environment resources require a total of 2179 Mi
 
 ----
 Memory overhead per virtual machine ≈ (1.002 * requested memory) + 146 MiB  \
-                + 8 * (number of vCPUs) \ <1>
+                + 8 MiB * (number of vCPUs) \ <1>
              + 16 MiB * (number of graphics devices) <2>
 ----