docs: add lines between diagrams

Author: rista404

contracts/hedera/README.md

@@ -28,10 +28,14 @@ The price of creating a new HTS token can be queried from `InterchainTokenServic
 
 Above you can see the general flow for deploying a new Interchain Token on Hedera. For local deployments however the user would deploy via the `InterchainTokenFactory`.
 
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 ![Mint Native Interchain Token](./diagrams/native_token_minting.png)
 
 Above you can see the flow for minting an existing native Interchain Token on Hedera. The minting must happen via the Token Manager. ITS and a custom minter are allowed to mint.
 
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 ![Register Custom HTS Token](./diagrams/register_custom_hts_token.png)
 
 Above you can see the flow for registering an existing HTS token as an Interchain Token on Hedera. A new Token Manager contract is deployed as a `LOCK/UNLOCK` manager.