docs: correct lineage wording (fine-tuned from closest-language base)

README.md

@@ -17,7 +17,7 @@ tags:
 
 # pipertts_pt-BR_dii
 
-This is a text-to-speech voice model for **Brazilian Portuguese**. The voice is **Dii**, a female voice. It uses the Piper VITS architecture, exported to ONNX for CPU inference. It was built by voice conversion from the base voice `pipertts_pt-PT_dii`.
+This is a text-to-speech voice model for **Brazilian Portuguese**. The voice is **Dii**, a female voice. It uses the Piper VITS architecture, exported to ONNX for CPU inference. It was fine-tuned from the base voice `pipertts_pt-PT_dii`, the closest available language for this voice.
 
 ## How to use