Fix a typo

Co-authored-by: Maximilian Kolb <[email protected]>

Author: aneta-petrova

guides/common/modules/ref_system-requirements.adoc

@@ -10,7 +10,7 @@ For more information about certified hypervisors, see https://access.redhat.com/
 endif::[]
 Follow these system requirements when installing {ProductName}:
 
-* Install {ProductName} on a freshly provisioned system that servers no other function except to run {ProductName}.
+* Install {ProductName} on a freshly provisioned system that serves no other function except to run {ProductName}.
 Do not use an existing system because the {Project} installer will affect the configuration of several components.
 * Ensure you have administrative user (root) access to the system.
 * Ensure the system meets the following requirements: