Removed deprecated eth_coinbase from json-rpc docs[#29747]

Author: MaryNfs

public/content/developers/docs/apis/json-rpc/index.md

@@ -383,31 +383,6 @@ curl -X POST --data '{"jsonrpc":"2.0","method":"eth_syncing","params":[],"id":1}
 }
 ```
 
-### eth_coinbase {#eth_coinbase}
-
-Returns the client coinbase address.
-
-**Parameters**
-
-None
-
-**Returns**
-
-`DATA`, 20 bytes - the current coinbase address.
-
-**Example**
-
-```js
-// Request
-curl -X POST --data '{"jsonrpc":"2.0","method":"eth_coinbase","params":[],"id":64}'
-// Result
-{
-  "id":64,
-  "jsonrpc": "2.0",
-  "result": "0x407d73d8a49eeb85d32cf465507dd71d507100c1"
-}
-```
-
 ### eth_chainId {#eth_chainId}
 
 Returns the chain ID used for signing replay-protected transactions.
@@ -1671,10 +1646,10 @@ geth --http --dev console 2>>geth.log
 
 This will start the HTTP RPC interface on `http://localhost:8545`.
 
-We can verify that the interface is running by retrieving the Coinbase address and balance using [curl](https://curl.se). Please note that data in these examples will differ on your local node. If you want to try these commands, replace the request params in the second curl request with the result returned from the first.
+We can verify that the interface is running by retrieving the Coinbase address(by obtaining the first address from the array of accounts) and balance using [curl](https://curl.se). Please note that data in these examples will differ on your local node. If you want to try these commands, replace the request params in the second curl request with the result returned from the first.
 
 ```bash
-curl --data '{"jsonrpc":"2.0","method":"eth_coinbase", "id":1}' -H "Content-Type: application/json" localhost:8545
+curl --data '{"jsonrpc":"2.0","method":"eth_accounts","params":[]", "id":1}' -H "Content-Type: application/json" localhost:8545
 {"id":1,"jsonrpc":"2.0","result":["0x9b1d35635cc34752ca54713bb99d38614f63c955"]}
 
 curl --data '{"jsonrpc":"2.0","method":"eth_getBalance", "params": ["0x9b1d35635cc34752ca54713bb99d38614f63c955", "latest"], "id":2}' -H "Content-Type: application/json" localhost:8545