fix: deprecated api methods (#375)

# Description

Updates API methods with deprecated ones.

## Linked Issues

N/A

## Additional context

GHD announcement pending to be published

Author: uF4No

content/20.zksync-protocol/10.api/20.ethereum-rpc.md

@@ -1296,7 +1296,7 @@ curl --request POST \
 
 ## `eth_protocolVersion`
 
-Returns the current Ethereum protocol version.
+Returns the current protocol version.
 
 #### Parameters
 
@@ -1327,7 +1327,7 @@ curl --request POST \
 ```json
 {
   "jsonrpc": "2.0",
-  "result": "zks/1",
+  "result": "zks/0.27.0",
   "id": 2
 }
 ```