rename FromLowerPriority to LowerPriorityOnly

Change-Id: I2060fee01e5618c2d452846ecbe18581e232e4ec

keps/83-workload-preemption/README.md

@@ -106,7 +106,7 @@ metadata:
 spec:
   preemption:
     withinCohort: Always
-    withinClusterQueue: FromLowerPriority
+    withinClusterQueue: LowerPriorityOnly
 ```
 
 ### Notes/Contraints/Caveats (Optional)
@@ -211,9 +211,9 @@ type ClusterQueueSpec struct {
 type PreemptionPolicy string
 
 const (
-  PreemptionPoliyNever = "Never"
-  PreemptionPoliyFromLowerPriority = "FromLowerPriority"
-  PreemptionPoliyAlways = "Always"
+  PreemptionPoliyNever             = "Never"
+  PreemptionPoliyLowerPriorityOnly = "LowerPriorityOnly"
+  PreemptionPoliyAlways            = "Always"
 )
 
 type ClusterQueuePreemption struct {
@@ -222,7 +222,7 @@ type ClusterQueuePreemption struct {
   // ClusterQueues in the cohort that are using more than their min quota.
   // Possible values are:
   // - `Never` (default): do not preempt workloads in the cohort.
-  // - `FromLowerPriority`: only preempt workloads in the cohort that have lower
+  // - `LowerPriorityOnly`: only preempt workloads in the cohort that have lower
   //   priority than the pending Workload.
   // - `Always`: preempt any workload in the cohort.
   withinCohort *PreemptionPolicy
@@ -232,8 +232,8 @@ type ClusterQueuePreemption struct {
   // the ClusterQueue.
   // Possible values are:
   // - `Never` (default): do not preempt workloads in the ClusterQueue.
-  // - `FromLowerPriority`: only preempt workloads in the ClusterQueue that have
-  //   lower   priority than the pendingWorkload.
+  // - `LowerPriorityOnly`: only preempt workloads in the ClusterQueue that have
+  //   lower priority than the pendingWorkload.
   withinClusterQueue *PreemptionPolicy
 }
 ```
@@ -338,7 +338,7 @@ The algorithm goes like follows:
 
   1. For preemption within cohort, we restrict the list to Workloads with lower
      priority than the pending Workload if
-     `.preemption.withinCohort=FromLowerPriority`
+     `.preemption.withinCohort=LowerPriorityOnly`
   2. For preemption within ClusterQueue, we only select Workloads with lower
      priority than the pending Workload.