remove copy for deprecated pipeline

Author: yiyixuxu

src/diffusers/pipelines/deprecated/versatile_diffusion/modeling_text_unet.py

@@ -267,7 +267,6 @@ def forward(
         return objs
 
 
-# Copied from diffusers.models.unet_2d_condition.UNet2DConditionModel with UNet2DConditionModel->UNetFlatConditionModel, nn.Conv2d->LinearMultiDim, Block2D->BlockFlat
 class UNetFlatConditionModel(ModelMixin, ConfigMixin):
     r"""
     A conditional 2D UNet model that takes a noisy sample, conditional state, and a timestep and returns a sample