Fix LED documentation (#17181)

* Fix markdown code block

* Use consistent spelling for self-attention

* Fix typos and phrasing

* Fix code style

src/transformers/models/led/configuration_led.py

@@ -86,18 +86,17 @@ class LEDConfig(PretrainedConfig):
     Example:
 
     ```python
-
-    ```
-
     >>> from transformers import LEDModel, LEDConfig
 
-        >>> # Initializing a LED allenai/led-base-16384 style configuration >>> configuration = LEDConfig()
+    >>> # Initializing a LED allenai/led-base-16384 style configuration
+    >>> configuration = LEDConfig()
 
-        >>> # Initializing a model from the allenai/led-base-16384 style configuration >>> model =
-        LEDModel(configuration)
+    >>> # Initializing a model from the allenai/led-base-16384 style configuration
+    >>> model = LEDModel(configuration)
 
-        >>> # Accessing the model configuration >>> configuration = model.config
-    """
+    >>> # Accessing the model configuration
+    >>> configuration = model.config
+    ```"""
     model_type = "led"
     attribute_map = {
         "num_attention_heads": "encoder_attention_heads",

src/transformers/models/led/modeling_led.py

@@ -1007,7 +1007,7 @@ class LEDDecoderLayer(nn.Module):
         """
         residual = hidden_states
 
-        # Self Attention
+        # Self-Attention
         # decoder uni-directional self-attention cached key/values tuple is at positions 1,2
         self_attn_past_key_value = past_key_value[:2] if past_key_value is not None else None
         # add present self-attn cache to positions 1,2 of present_key_value tuple
@@ -1437,13 +1437,11 @@ class LEDSeq2SeqQuestionAnsweringModelOutput(ModelOutput):
 
 
 LED_START_DOCSTRING = r"""
-    This model inherits from [`PreTrainedModel`]. Check the superclass documentation for the generic methods the
-    library implements for all its model (such as downloading or saving, resizing the input embeddings, pruning heads
-    etc.)
+    This model inherits from [`PreTrainedModel`]. See the superclass documentation for the generic methods the library
+    implements for all its models (such as downloading or saving, resizing the input embeddings, pruning heads etc.)
 
     This model is also a PyTorch [torch.nn.Module](https://pytorch.org/docs/stable/nn.html#torch.nn.Module) subclass.
-    Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general usage
-    and behavior.
+    Use it as a regular PyTorch Module and refer to the PyTorch documentation for general usage and behavior.
 
     Parameters:
         config ([`LEDConfig`]):
@@ -1595,7 +1593,7 @@ LED_INPUTS_DOCSTRING = r"""
 
 class LEDEncoder(LEDPreTrainedModel):
     """
-    Transformer encoder consisting of *config.encoder_layers* self attention layers. Each layer is a
+    Transformer encoder consisting of *config.encoder_layers* self-attention layers. Each layer is a
     [`LEDEncoderLayer`].
 
     Args:
@@ -1643,7 +1641,7 @@ class LEDEncoder(LEDPreTrainedModel):
         self.post_init()
 
     def _merge_to_attention_mask(self, attention_mask: torch.Tensor, global_attention_mask: torch.Tensor):
-        # longformer self attention expects attention mask to have 0 (no attn), 1 (local attn), 2 (global attn)
+        # longformer self-attention expects attention mask to have 0 (no attn), 1 (local attn), 2 (global attn)
         # (global_attention_mask + 1) => 1 for local attention, 2 for global attention
         # => final attention_mask => 0 for no attention, 1 for local attention 2 for global attention
         if attention_mask is not None:

src/transformers/models/led/modeling_tf_led.py

@@ -1238,7 +1238,7 @@ class TFLEDDecoderLayer(tf.keras.layers.Layer):
         """
         residual = hidden_states
 
-        # Self Attention
+        # Self-Attention
         # decoder uni-directional self-attention cached key/values tuple is at positions 1,2
         self_attn_past_key_value = past_key_value[:2] if past_key_value is not None else None
         # add present self-attn cache to positions 1,2 of present_key_value tuple
@@ -1612,7 +1612,7 @@ LED_INPUTS_DOCSTRING = r"""
 class TFLEDEncoder(tf.keras.layers.Layer):
     config_class = LEDConfig
     """
-    Transformer encoder consisting of *config.encoder_layers* self attention layers. Each layer is a
+    Transformer encoder consisting of *config.encoder_layers* self-attention layers. Each layer is a
     [`TFLEDEncoderLayer`].
 
     Args: