fix README link

Author: vxw3t8fhjsdkghvbdifuk

README.md

@@ -21,7 +21,7 @@
 
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-**Documentation**: <a href="https://github.com/huggingface/lighteval/wiki" target="_blank">Lighteval's Wiki</a>
+**Documentation**: <a href="https://huggingface.co/docs/lighteval/index" target="_blank">Lighteval's Wiki</a>
 
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