Merge branch 'master' into fix-grpc-server

Author: yihuang

docs/ibc/overview.md

@@ -144,7 +144,7 @@ After an acknowledgement is received successfully on the original sender the cha
 To learn more about IBC, check out the following specifications:
 
 - [IBC specs](https://github.com/cosmos/ibc/tree/master/spec)
-- [IBC protocol on the Cosmos SDK](https://github.com/cosmos/ibc-go/blob/main/docs/spec.md)
+- [IBC protocol on the Cosmos SDK](https://github.com/cosmos/ibc-go/tree/main/docs)
 
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