Update concepts-clusters-workloads.md

Author: andynava

articles/aks/concepts-clusters-workloads.md

@@ -64,9 +64,9 @@ To run your applications and supporting services, you need a Kubernetes *node*.
 
 ![Azure virtual machine and supporting resources for a Kubernetes node](media/concepts-clusters-workloads/aks-node-resource-interactions.png)
 
-The Azure VM size for your nodes defines how many CPUs, how much memory, and the size and type of storage available (such as high-performance SSD or regular HDD). If you anticipate a need for applications that require large amounts of CPU and memory or high-performance storage, plan the node size accordingly. You can also scale up the number of nodes in your AKS cluster to meet demand.
+The Azure VM size for your nodes defines how many CPUs, how much memory, and the size and type of storage available (such as high-performance SSD or regular HDD). If you anticipate a need for applications that require large amounts of CPU and memory or high-performance storage, plan the node size accordingly. You can also scale out the number of nodes in your AKS cluster to meet demand.
 
-In AKS, the VM image for the nodes in your cluster is currently based on Ubuntu Linux or Windows Server 2019. When you create an AKS cluster or scale up the number of nodes, the Azure platform creates the requested number of VMs and configures them. There's no manual configuration for you to perform. Agent nodes are billed as standard virtual machines, so any discounts you have on the VM size you're using (including [Azure reservations][reservation-discounts]) are automatically applied.
+In AKS, the VM image for the nodes in your cluster is currently based on Ubuntu Linux or Windows Server 2019. When you create an AKS cluster or scale out the number of nodes, the Azure platform creates the requested number of VMs and configures them. There's no manual configuration for you to perform. Agent nodes are billed as standard virtual machines, so any discounts you have on the VM size you're using (including [Azure reservations][reservation-discounts]) are automatically applied.
 
 If you need to use a different host OS, container runtime, or include custom packages, you can deploy your own Kubernetes cluster using [aks-engine][aks-engine]. The upstream `aks-engine` releases features and provides configuration options before they are officially supported in AKS clusters. For example, if you wish to use a container runtime other than Moby, you can use `aks-engine` to configure and deploy a Kubernetes cluster that meets your current needs.
 
@@ -95,7 +95,7 @@ To maintain node performance and functionality, resources are reserved on each n
 
 1. The kubelet daemon is installed on all Kubernetes agent nodes to manage container creation and termination. By default on AKS, this daemon has the following eviction rule: *memory.available<750Mi*, which means a node must always have at least 750 Mi allocatable at all times.  When a host is below that threshold of available memory, the kubelet will terminate one of the running pods to free memory on the host machine and protect it. This is a reactive action once available memory decreases beyond the 750Mi threshold.
 
-2. The second value is a progressive rate of memory reservations for the kubelet daemon to properly function (kube-reserved).
+2. The second value is a regressive rate of memory reservations for the kubelet daemon to properly function (kube-reserved).
     - 25% of the first 4 GB of memory
     - 20% of the next 4 GB of memory (up to 8 GB)
     - 10% of the next 8 GB of memory (up to 16 GB)
@@ -117,7 +117,7 @@ For associated best practices, see [Best practices for basic scheduler features
 Nodes of the same configuration are grouped together into *node pools*. A Kubernetes cluster contains one or more node pools. The initial number of nodes and size are defined when you create an AKS cluster, which creates a *default node pool*. This default node pool in AKS contains the underlying VMs that run your agent nodes.
 
 > [!NOTE]
-> To ensure your cluster to operate reliably, you should run at least 2 (two) nodes in the default node pool.
+> To ensure your cluster operates reliably, you should run at least 2 (two) nodes in the default node pool.
 
 When you scale or upgrade an AKS cluster, the action is performed against the default node pool. You can also choose to scale or upgrade a specific node pool. For upgrade operations, running containers are scheduled on other nodes in the node pool until all the nodes are successfully upgraded.