[Doc] Fix a link to Weilin Zhao (#5706)

Signed-off-by: windsonsea <haifeng.yao@daocloud.io>

docs/backend/speculative_decoding.ipynb

@@ -177,7 +177,7 @@
     "\n",
     "In our implementation, set `--speculative-token-map` to enable the optimization. You can get the high-frequency token in FR-Spec from [this model](https://huggingface.co/thunlp/LLaMA3-Instruct-8B-FR-Spec). Or you can obtain high-frequency token by directly downloading these token from [this repo](https://github.com/thunlp/FR-Spec/tree/main?tab=readme-ov-file#prepare-fr-spec-vocabulary-subset).\n",
     "\n",
-    "Thanks for the contribution from [Weilin Zhao](https://github.com/https://github.com/Achazwl) and [Zhousx](https://github.com/Zhou-sx). "
+    "Thanks for the contribution from [Weilin Zhao](https://github.com/Achazwl) and [Zhousx](https://github.com/Zhou-sx). "
    ]
   },
   {