make embeddings plural in warning message (#11228)

src/transformers/tokenization_utils_base.py

@@ -1828,7 +1828,7 @@ class PreTrainedTokenizerBase(SpecialTokensMixin):
         added_tokens = tokenizer.sanitize_special_tokens()
         if added_tokens:
             logger.warning(
-                "Special tokens have been added in the vocabulary, make sure the associated word embedding are fine-tuned or trained."
+                "Special tokens have been added in the vocabulary, make sure the associated word embeddings are fine-tuned or trained."
             )
 
         return tokenizer