fix naming

Author: leandroberetta

docs/api.md

@@ -324,7 +324,7 @@ Following is the supported API format for writing to loki:
          format: the format of each line: printf (writes using golang's default map printing), fields (writes one key and value field per line) or json (default)
          reorder: reorder json map keys
          clientProtocol: type of client protocol to use: 'http' or 'grpc' (default: 'http')
-         grpcConfig: gRPC client configuration (used only for gRPC client protocol)
+         grpcConfig: gRPC client configuration (used only for gRPC client type)
              keepAlive: keep alive interval
              keepAliveTimeout: keep alive timeout
              tls: TLS configuration