remove copied from

Author: a-r-r-o-w

src/diffusers/pipelines/cogvideo/pipeline_cogvideox_image2video.py

@@ -528,7 +528,6 @@ def unfuse_qkv_projections(self) -> None:
             self.transformer.unfuse_qkv_projections()
             self.fusing_transformer = False
 
-    # Copied from diffusers.pipelines.cogvideo.pipeline_cogvideox.CogVideoXPipeline._prepare_rotary_positional_embeddings
     def _prepare_rotary_positional_embeddings(
         self,
         height: int,