message: docs: Fix spelling of get_blockchain_info RPC method
diff: @@ -766,7 +766,7 @@ curl -H 'content-type:application/json' \
  }
  ```
  -### get_blochchain_info
  +### get_blockchain_info
  Return state info of blockchain
  @@ -774,7 +774,7 @@ Return state info of blockchain
  ```bash
  curl -H 'content-type:application/json' \
  - -d '{"id": 2, "jsonrpc": "2.0", "method": "get_blochchain_info", "params": []}' \
  + -d '{"id": 2, "jsonrpc": "2.0", "method": "get_blockchain_info", "params": []}' \
  http://localhost:8114'
  ```
  