minor correction to documentation

Author: skamath

docs/apis/PowerManagerPlugin.md

@@ -1306,7 +1306,7 @@ Triggered before change then device power state. The power state (must be one of
 | params.currentState | string | Current Power State |
 | params.newState | string | Changing power state to this New Power State |
 | params.transactionId | integer | transactionId to be used when invoking prePowerChangeComplete() / delayPowerModeChangeBy API |
-| params.stateChangeAfter | integer | seconds after which the actual power mode will be applied |
+| params.stateChangeAfter | integer | seconds after which the actual power mode will be applied, if the client does not call prePowerChangeComplete() API |
 
 ### Example
 

tools/json_generator/output/PowerManager/PowerManager.json

@@ -828,7 +828,7 @@
                         "example": 3
                     },
                     "stateChangeAfter": {
-                        "summary": "seconds after which the actual power mode will be applied.",
+                        "summary": "seconds after which the actual power mode will be applied, if the client does not call prePowerChangeComplete() API",
                         "type": "integer",
                         "example": 1
                     }