[doc] fix llama2 code link (#4726)

* [doc] fix llama2 code link

* [doc] fix llama2 code link

* [doc] fix llama2 code link

README.md

@@ -224,7 +224,7 @@ Acceleration of [AlphaFold Protein Structure](https://alphafold.ebi.ac.uk/)
 </p>
 
 - 70 billion parameter LLaMA2 model training accelerated by 195%
-[[code]](https://github.com/hpcaitech/ColossalAI/tree/example/llama/examples/language/llama)
+[[code]](https://github.com/hpcaitech/ColossalAI/tree/main/examples/language/llama2)
 [[blog]](https://www.hpc-ai.tech/blog/70b-llama2-training)
 
 ### LLaMA1

docs/README-zh-Hans.md

@@ -217,7 +217,7 @@ Colossal-AI 为您提供了一系列并行组件。我们的目标是让您的
 </p>
 
 - 700亿参数LLaMA2训练加速195%
-[[code]](https://github.com/hpcaitech/ColossalAI/tree/example/llama/examples/language/llama)
+[[code]](https://github.com/hpcaitech/ColossalAI/tree/main/examples/language/llama2)
 [[blog]](https://www.hpc-ai.tech/blog/70b-llama2-training)
 
 ### LLaMA1

examples/language/llama2/README.md

@@ -6,7 +6,7 @@
 </p>
 
 - 70 billion parameter LLaMA2 model training accelerated by 195%
-[[code]](https://github.com/hpcaitech/ColossalAI/tree/example/llama/examples/language/llama)
+[[code]](https://github.com/hpcaitech/ColossalAI/tree/main/examples/language/llama2)
 [[blog]](https://www.hpc-ai.tech/blog/70b-llama2-training)
 
 ### LLaMA1