Update content/en/concepts/placement.md

Co-authored-by: Jian Qiu <[email protected]>

content/en/concepts/placement.md

@@ -436,7 +436,7 @@ The `decisionStrategy` section includes the following fields:
   - `groupClusterSelector`: Defines the label selector to select clusters subset by label.
 - `clustersPerDecisionGroup`: A specific number or percentage of the total selected 
   clusters. The specific number will divide the placementDecisions to decisionGroups,
-  each group has max number of clusters equal to that specific number.
+ the max number of clusters in each group equal  to that specific number.
 
 With this decision strategy defined, the placement status will list the group result, 
 including the decision group name and index, the cluster count, and the corresponding