Eliminsted the duplicate VM Size section

As reported in Github issue 45597, the VM Size section was duplicated in two places with the exact same text.  I just deleted the second one since it was an exact duplicate.

Also on the first on, I fixed the casing on the section title to "VM Size" from "Vm size" so it matches everything else.

Author: DavidCBerry13

articles/virtual-machines/linux/overview.md

@@ -55,7 +55,7 @@ This table shows some of the ways you can get a list of available locations.
 ## Availability
 Azure announced an industry leading single instance virtual machine Service Level Agreement of 99.9% provided you deploy the VM with premium storage for all disks.  In order for your deployment to qualify for the standard 99.95% VM Service Level Agreement, you still need to deploy two or more VMs running your workload inside of an availability set. An availability set ensures that your VMs are distributed across multiple fault domains in the Azure data centers as well as deployed onto hosts with different maintenance windows. The full [Azure SLA](https://azure.microsoft.com/support/legal/sla/virtual-machines/) explains the guaranteed availability of Azure as a whole.
 
-## VM size
+## VM Size
 The [size](sizes.md?toc=%2fazure%2fvirtual-machines%2flinux%2ftoc.json) of the VM that you use is determined by the workload that you want to run. The size that you choose then determines factors such as processing power, memory, and storage capacity. Azure offers a wide variety of sizes to support many types of uses.
 
 Azure charges an [hourly price](https://azure.microsoft.com/pricing/details/virtual-machines/linux/) based on the VM’s size and operating system. For partial hours, Azure charges only for the minutes used. Storage is priced and charged separately.
@@ -89,10 +89,6 @@ Microsoft works closely with partners to ensure the images available are updated
 * Docker - [Azure Marketplace - Azure Container Service with Docker Swarm](https://azure.microsoft.com/marketplace/partners/microsoft/acsswarms/)
 * Jenkins - [Azure Marketplace - CloudBees Jenkins Platform](https://azuremarketplace.microsoft.com/en-us/marketplace/apps/cloudbees.cloudbees-core-contact)
 
-## VM Sizes
-The [size](sizes.md) of the VM that you use is determined by the workload that you want to run. The size that you choose then determines factors such as processing power, memory, and storage capacity. Azure offers a wide variety of sizes to support many types of uses.
-
-Azure charges an [hourly price](https://azure.microsoft.com/pricing/details/virtual-machines/linux/) based on the VM’s size and operating system. For partial hours, Azure charges only for the minutes used. Storage is priced and charged separately.
 
 ## Cloud-init