Fixed README.md typos

SwitchEngines/README.md

@@ -763,10 +763,10 @@ be remotely controlled, which complicates service deployment operations:
 indeed, Terraform is normally installed and called from a workstation. There
 are two possibilities:
 
-a. Use TF's special *resource-less provisioners* within the same TF plan to
+1. Use TF's special *resource-less provisioners* within the same TF plan to
    spawn operations on the target infrastructure after its provisioning.
 
-a. Use TF's official Kubernetes provider with an auxiliary TF plan
+1. Use TF's official Kubernetes provider with an auxiliary TF plan
    exploiting and SSH tunnel to the instance, after its provisioning by the
    main TF plan.