Removing extra space in large command for speech-pretraining example (#38705)

Removing extra space in Large command

examples/pytorch/speech-pretraining/README.md

@@ -141,7 +141,7 @@ accelerate launch run_wav2vec2_pretraining_no_trainer.py \
 	--weight_decay=0.01 \
 	--max_duration_in_seconds=20.0 \
 	--min_duration_in_seconds=2.0 \
-	--model_name_or_path=./ 
+	--model_name_or_path=./ \
 	--logging_steps=1 \
 	--saving_steps=10000 \
 	--per_device_train_batch_size=2 \