minor gramattical fixes

Signed-off-by: Itamar Holder <[email protected]>

Author: iholder101

content/en/docs/setup/production-environment/tools/kubeadm/install-kubeadm.md

@@ -26,7 +26,7 @@ see the [Creating a cluster with kubeadm](/docs/setup/production-environment/too
 * Full network connectivity between all machines in the cluster (public or private network is fine).
 * Unique hostname, MAC address, and product_uuid for every node. See [here](#verify-mac-address) for more details.
 * Certain ports are open on your machines. See [here](#check-required-ports) for more details.
-* Swap configuration. The default behavior of a kubelet was to fail to start if swap memory was detected on a node.
+* Swap configuration: The default behavior of a kubelet is to fail to start if swap memory is detected on a node.
   See [Swap memory management](/docs/concepts/architecture/nodes/#swap-memory) for more details.
   * You **MUST** disable swap if the kubelet is not properly configured to use swap. For example, `sudo swapoff -a`
     will disable swapping temporarily. To make this change persistent across reboots, make sure swap is disabled in