docs: content for KeptnTaskDefinition ref and tasks guide

docs/content/en/docs/concepts/workloads/_index.md

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-A Workload contains information about which tasks should be performed during the `preDeployment` as well as
-the `postDeployment`
-phase of a deployment.
-In its state it keeps track of the currently active `Workload Instances`, which are responsible
-for doing those checks for
-a particular instance of a Deployment/StatefulSet/ReplicaSet (e.g. a Deployment of a certain version).
+A `KeptnWorkload`resource contains information about
+which tasks should be performed during the `preDeployment`
+or `postDeployment` phase of a deployment.
+In its state,
+it keeps track of the currently active `Workload Instances`,
+which are responsible for doing those checks
+for a particular instance of a Deployment/StatefulSet/ReplicaSet
+(e.g. a Deployment of a certain version).
 
-### Keptn Workload Instance
+## KeptnWorkload
 
-A Workload Instance is responsible for executing the pre- and post deployment checks of a workload.
-In its state, it
-keeps track of the current status of all checks, as well as the overall state of
-the Pre Deployment phase, which can be used by the scheduler to tell that a pod can be allowed to be placed on a node.
-Workload Instances have a reference to the respective Deployment/StatefulSet/ReplicaSet, to check if it has reached the
-desired state.
-If it detects that the referenced object has reached
-its desired state (e.g. all pods of a deployment are up and running), it will be able to tell that
-a `PostDeploymentCheck` can be triggered.
+A `KeptnWorkload` resource augments a Kubernetes
+[Workload](https://kubernetes.io/docs/concepts/workloads/)
+with the ability to handle extra phases.
+KLT generates the `KeptnWorkload` resource
+from metadata information;
+it is not necessary to manually create a YAML file that defines it.
+
+A `KeptnWorkload` instance is responsible for executing
+the pre- and post deployment checks of a workload.
+In its state, it keeps track of the current status of all checks,
+as well as the overall state of the Pre Deployment phase,
+which the scheduler can use to determine
+whether the deployment should proceed.
+`KeptnWorkload` instances refer
+to the respective Pod/DeamonSet/StatefulSet/ReplicaSet,
+to check whether it has reached the desired state.
+If it detects that the referenced object has reached its desired state
+(e.g. all pods of a deployment are up and running),
+it knows that a `PostDeploymentCheck` can be triggered.