Update the description in README_AutoScaling.md

Also updated the example code so it's complete and consistent with other examples + removed unused import.

Author: mukhtar

events/README_AutoScaling.md

@@ -1,16 +1,21 @@
 # Sample Function
 
-The following is a sample class and Lambda function that receives Amazon S3 event record data as an input and writes some of the record data to CloudWatch Logs. (Note that by default anything written to Console will be logged as CloudWatch Logs events.)
+The following is a sample Lambda function that receives an Auto Scaling event as an input and logs the EC2 instance ID to CloudWatch Logs. (Note that by default anything written to Console will be logged as CloudWatch Logs events.)
 
 ```go
-
 import (
-    "strings"
-    "github.com/aws/aws-lambda-go/events")
+	"context"
+	"fmt"
+
+	"github.com/aws/aws-lambda-go/events"
+	"github.com/aws/aws-lambda-go/lambda"
+)
 
 func handler(ctx context.Context, autoScalingEvent events.AutoScalingEvent) {
-        fmt.Printf("Instance-Id available in event is %s \n",autoScalingEvent.Detail["EC2InstanceId"]) 
-    }
+	fmt.Printf("Instance-Id available in event is %s \n", autoScalingEvent.Detail["EC2InstanceId"])
 }
 
+func main() {
+	lambda.Start(handler)
+}
 ```