Update docs/source/en/api/pipelines/hunyuan_video15.md

Author: yiyixuxu

docs/source/en/api/pipelines/hunyuan_video15.md

@@ -54,7 +54,7 @@ export_to_video(video, "output.mp4", fps=15)
 
 ## Notes
 
-- HunyuanVideo1.5 use attention masks with avariable-length sequences. For best performance, we recommend using an attention backend that handles padding efficiently.
+- HunyuanVideo1.5 use attention masks with variable-length sequences. For best performance, we recommend using an attention backend that handles padding efficiently.
 
     - **H100/H800:** `_flash_3_hub` or `_flash_varlen_3`
     - **A100/A800/RTX 4090:** `flash` or `flash_varlen`