fixed acrolinx issues.

Author: Julia Shimanskiy

articles/virtual-machines/sizes-hpc.md

@@ -78,7 +78,7 @@ In certain deployments of A8 and A9 instances, the HpcVmDrivers extension is add
   } 
   ```
 
-  The following command installs the latest version 1.0 InfiniBandDriverWindows extension on all RDMA-capable VMs in an existing VM scale set named *myVMSS* deployed in the resource group named *myResourceGroup*:
+  The following command installs the latest version 1.0 InfiniBandDriverWindows extension on all RDMA-capable VMs in an existing virtual machine scale set named *myVMSS* deployed in the resource group named *myResourceGroup*:
 
   ```powershell
   $VMSS = Get-AzVmss -ResourceGroupName "myResourceGroup" -VMScaleSetName "myVMSS"
@@ -99,7 +99,7 @@ Azure provides several options to create clusters of Windows HPC VMs that can co
 
 - **Virtual machine scale sets** - In a virtual machine scale set, ensure that you limit the deployment to a single placement group. For example, in a Resource Manager template, set the `singlePlacementGroup` property to `true`. 
 
-- **MPI among virtual machines** - If MPI communication if required between virtual machines (VMs), ensure that the VMs are in the same availability set or the virtual machine same scale set.
+- **MPI among virtual machines** - If MPI communication is required between virtual machines (VMs), ensure that the VMs are in the same availability set or the virtual machine same scale set.
 
 - **Azure CycleCloud** - Create an HPC cluster in [Azure CycleCloud](/azure/cyclecloud/) to run MPI jobs on Windows nodes.