Update docs/proposals/107-spark-client/README.md

Co-authored-by: Andrey Velichkevich <[email protected]>
Signed-off-by: Shekhar Prasad Rajak <[email protected]>

Author: Shekharrajak

docs/proposals/107-spark-client/README.md

@@ -941,10 +941,11 @@ spark_client.wait_for_job_status(features.submission_id)
 # Step 2: Model training with Trainer
 trainer_client = TrainerClient()
 trainer_client.train(
-    name="train-model",
-    func=train_func,
-    num_nodes=4,
-)
+    trainer=CustomTrainer(
+        func=train_func,
+        num_nodes=4
+        )
+  )
 ```
 
 #### Integration with Pipelines