TGW Peer Comments in Config Walkthrough incorrect

**Describe the bug**
README contains example for Transit Gateway Peer import:

```tgwPeers:
toUsEast2:
# REQUIRED: Existing Transit Gateway (see above if you're relying on vpcBuilder to create the TGW)
existingTgwId: tgw-12345
# REQUIRED: Existing Transit Gateway Attachment Identifier for the Direct Connect Gateway
existingTgwPeerTransitGatewayAttachId: tgw-attach-12345
# REQUIRED: Existing Transit Gateway Route Table associated with the Direct Connect Gateway
existingTgwPeerTransitGatewayRouteTableId: tgw-rtb-12345
```

Comments indicate this should be the one for a Direct Connect gateway which is not correct.