update README

README.md

@@ -662,9 +662,9 @@ datasets:
       # For `completion` datsets only, uses the provided field instead of `text` column
       field:
 
-# If true, the datasets will not be shuffled and will keep their original order in `datasets`.
-# The same applies to the `test_datasets` option and the `pretraining_dataset` option. Default is false.
-not_shuffle_merged_datasets: false
+# If false, the datasets will not be shuffled and will keep their original order in `datasets`.
+# The same applies to the `test_datasets` option and the `pretraining_dataset` option. Default is true.
+shuffle_merged_datasets: true
 
 # A list of one or more datasets to eval the model with.
 # You can use either test_datasets, or val_set_size, but not both.