chore: update desc

assets/gradio_description_upload.md

@@ -1,2 +1,2 @@
 ## 🤗 This is the official gradio demo for **LivePortrait**.
-<div style="font-size: 1.2em;">Please upload or use the webcam to get a source portrait to the <strong>Source Portrait</strong> field and a driving video to the <strong>Driving Video</strong> field.</div>
+<div style="font-size: 1.2em;">Please upload or use webcam to get a <strong>Source Portrait</strong> and upload a <strong>Driving Video</strong>.</div>