Update understand-suse-reservation-charges.md

fix "a only" per Acrolinx

Author: jborsecnik

articles/cost-management-billing/reservations/understand-suse-reservation-charges.md

@@ -54,7 +54,7 @@ For example, if you buy a plan for SUSE Linux Enterprise Server for HPC Priority
 - 1 deployed VM with 3 or 4 vCPUs,
 - or 0.77 or about 77% of a VM with 5 or more vCPUs.
 
-The ratio for 5 or more vCPUs is 2.6. So a reservation for SUSE with a VM with 5 or more vCPUs covers a only portion of the software cost, which is about 77%.
+The ratio for 5 or more vCPUs is 2.6. So a reservation for SUSE with a VM with 5 or more vCPUs covers only a portion of the software cost, which is about 77%.
 
 The following tables show the software plans you can buy a reservation for, their associated usage meters, and the ratios for each.