chore(ec2): correct device name in BastionHostLinux example (#29114)

Closes #29103. 

I tested the example and it deploys.

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Author: msambol

packages/aws-cdk-lib/aws-ec2/README.md

@@ -1429,7 +1429,7 @@ EBS volume for the bastion host can be encrypted like:
 const host = new ec2.BastionHostLinux(this, 'BastionHost', {
   vpc,
   blockDevices: [{
-    deviceName: 'EBSBastionHost',
+    deviceName: '/dev/sdh',
     volume: ec2.BlockDeviceVolume.ebs(10, {
       encrypted: true,
     }),