Merge pull request #404 from sven-hash/patch-11

remove: map only avalaible in testnet

Author: polarker

docs/ralph/types.md

@@ -164,8 +164,6 @@ Contract Bar() {
 
 ### Map
 
-The map data structure is currently available in the [devnet release](https://github.com/alephium/alephium-stack/tree/master/devnet) and the [testnet release](https://github.com/alephium/alephium-stack/tree/master/devnet) of the full node.
-
 In Ralph, Maps are defined as global contract attributes, eliminating the need for initialization. The syntax is `mapping[KeyType, ValueType] mapName` where the `KeyType` can be any primitive types (Bool, U256, I256, Address, ByteVec), and the `ValueType` can be any type.
 
 Under the hood, each Map entry is constructed as a subcontract of the current contract. Therefore, creating a map entry entails a minimal contract deposit, easily done using the built-in function `mapEntryDeposit!()`.