Fix typo in comment (#14102)

src/transformers/models/gpt2/modeling_gpt2.py

@@ -808,7 +808,7 @@ class GPT2Model(GPT2PreTrainedModel):
             attention_mask = attention_mask.to(dtype=self.dtype)  # fp16 compatibility
             attention_mask = (1.0 - attention_mask) * -10000.0
 
-        # If a 2D ou 3D attention mask is provided for the cross-attention
+        # If a 2D or 3D attention mask is provided for the cross-attention
         # we need to make broadcastable to [batch_size, num_heads, seq_length, seq_length]
         if self.config.add_cross_attention and encoder_hidden_states is not None:
             encoder_batch_size, encoder_sequence_length, _ = encoder_hidden_states.size()