Add 4Kb limit to notifications docs (#24)

- Fix formatting issues

source/services/notifications.md

@@ -2,7 +2,9 @@
 Allows users to send signed transaction messages between devices taking part in the signing process.
 
 [GitHub](https://github.com/gnosis/safe-notification-service)
+
 [Releases](https://github.com/gnosis/safe-notification-service/releases)
+
 [Swagger](https://safe-notification.gnosis.io/)
 
 ## Database model
@@ -145,7 +147,7 @@ Signature address cannot be contained in devices list.
 ```js
 {
 	"devices": ["<checksumed_address>", ...],
-	"message": "<string>",
+	"message": "<stringified-json>", // max of 4Kb due to Firebase limitations
 	"signature": { // signs sha3("GNO" + <message>)
         "v": "<integer>",
         "r": "<string>", // stringified int

source/services/relay.md

@@ -4,14 +4,18 @@ This service allows us to have owners of the Safe contract that don’t need to
 Our target user hold crypto in a centralized exchange (or on another Ethereum address) and wants to move it to a secure account. We don’t want the user to trust us, for moving the funds and deploying the smart contract on their behalf. We on the other side want to prevent users from spamming our services, there shouldn't be a need to trust the user either. The process for this is descriped in the [contracts deployment section](../contracts/deployment.html).
 
 [GitHub](https://github.com/gnosis/safe-relay-service)
+
 [Releases](https://github.com/gnosis/safe-relay-service/releases)
+
 [Swagger (Mainnet version)](https://safe-relay.gnosis.io/)
+
 [Swagger (Rinkeby version)](https://safe-relay.rinkeby.gnosis.io/)
+
 [Safe Contracts and addresses on networks](https://github.com/gnosis/safe-contracts/releases)
 
 ## Flows
 
-### Safe creation flowchart
+### Safe creation old flowchart (without CREATE2, deprecated)
 
 <img src="../_static/relay_service/safe_creation.png" style="background: white">
 

source/services/transactions.md

@@ -5,9 +5,13 @@ Transactions are detected in an automatic way, so there is no need of informing
 previous versions of the *Transaction Service*
 
 [GitHub](https://github.com/gnosis/safe-transaction-service)
+
 [Releases](https://github.com/gnosis/safe-transaction-service/releases)
+
 [Swagger (Mainnet version)](https://safe-transaction.gnosis.io/)
+
 [Swagger (Rinkeby version)](https://safe-transaction.rinkeby.gnosis.io/)
+
 [Safe Contracts and addresses on networks](https://github.com/gnosis/safe-contracts/releases)
 
 ## API Endpoints