Update README_sdxl.md to change the note on default hyperparameters (#4258)

examples/dreambooth/README_sdxl.md

@@ -177,7 +177,7 @@ SDXL's VAE is known to suffer from numerical instability issues. This is why we
 
 ## Notes
 
-In our experiments we found that SDXL yields very good initial results using the default settings of the script. We didn't explore further hyper-parameter tuning experiments, but we do encourage the community to explore this avenue further and share their results with us 🤗
+In our experiments, we found that SDXL yields good initial results without extensive hyperparameter tuning. For example, without fine-tuning the text encoders and without using prior-preservation, we observed decent results. We didn't explore further hyper-parameter tuning experiments, but we do encourage the community to explore this avenue further and share their results with us 🤗
 
 ## Results