Use single-word prompt example

inference_example.py

@@ -10,7 +10,7 @@ Usage:
       --vace_video   path/to/source.mp4 \
       --vace_mask    path/to/mask.mp4 \
       --glyph_video  path/to/target_glyph.mp4 \
-      --prompt       "Change the sign to read 'HILTON'" \
+      --prompt       "HILTON" \
       --output       out.mp4
 
 Hardware: