Update ibert.rst (#10445)

docs/source/model_doc/ibert.rst

@@ -16,7 +16,7 @@ I-BERT
 Overview
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-The I-BERT model was proposed in `I-BERT: Integer-only BERT Quantization <https://arxiv.org/abs/2006.10220>`__ by
+The I-BERT model was proposed in `I-BERT: Integer-only BERT Quantization <https://arxiv.org/abs/2101.01321>`__ by
 Sehoon Kim, Amir Gholami, Zhewei Yao, Michael W. Mahoney and Kurt Keutzer. It's a quantized version of RoBERTa running
 inference up to four times faster.