fix: deposit for dids are wrong (#323)

docs/concepts/02_did.md

@@ -75,7 +75,7 @@ For a detailed developer-oriented guide to KILT DIDs, read the [DID Cookbook sec
 
 ## Storing a DID
 
-Storing a DID on the KILT blockchain requires a deposit, consisting of a base deposit and an additional fee. The base deposit is a fixed amount of 4 KILT, while the additional fee is 0.05 KILT.
+Storing a DID on the KILT blockchain requires a deposit, consisting of a base deposit and an additional fee. The base deposit is a fixed amount of 2 KILT, while the additional fee is 0.05 KILT.
 
 In addition to the base deposit and fee, the total deposit increases based on the storage space used by the DID. Each byte of storage occupied by the DID requires a deposit of 50 micro KILT (0.000005 KILT).
 
@@ -84,4 +84,4 @@ The more services and keys in the DID, the larger the storage space required and
 
 When updating the DID, the deposit is automatically adjusted to match the updated size. This ensures that the deposit accurately reflects the current storage requirements of the DID, whether they increase or decrease.
 
-You can reclaim the deposit when the DID is deleted from the blockchain, allowing users to retrieve the deposited amount. However, the additional fee can't be refunded once paid.
+You can reclaim the deposit when the DID is deleted from the blockchain, allowing users to retrieve the deposited amount. However, the additional fee can't be refunded once paid.