Fixed typo in comments/documentation for Pipelines documentation (#30170)

Update feature_extraction.py - Fixed typo in comments/documentation

src/transformers/pipelines/feature_extraction.py

@@ -24,7 +24,7 @@ class FeatureExtractionPipeline(Pipeline):
 
     >>> extractor = pipeline(model="google-bert/bert-base-uncased", task="feature-extraction")
     >>> result = extractor("This is a simple test.", return_tensors=True)
-    >>> result.shape  # This is a tensor of shape [1, sequence_lenth, hidden_dimension] representing the input string.
+    >>> result.shape  # This is a tensor of shape [1, sequence_length, hidden_dimension] representing the input string.
     torch.Size([1, 8, 768])
     ```