update version in link

x/authz/README.md

@@ -82,7 +82,7 @@ https://github.com/cosmos/cosmos-sdk/blob/v0.47.0-rc1/x/bank/types/send_authoriz
 
 #### StakeAuthorization
 
-`StakeAuthorization` implements the `Authorization` interface for messages in the [staking module](https://docs.cosmos.network/main/build/modules/staking). It takes an `AuthorizationType` to specify whether you want to authorise delegating, undelegating or redelegating (i.e. these have to be authorised separately). It also takes an optional `MaxTokens` that keeps track of a limit to the amount of tokens that can be delegated/undelegated/redelegated. If left empty, the amount is unlimited. Additionally, this Msg takes an `AllowList` or a `DenyList`, which allows you to select which validators you allow or deny grantees to stake with.
+`StakeAuthorization` implements the `Authorization` interface for messages in the [staking module](https://docs.cosmos.network/v0.50/build/modules/staking). It takes an `AuthorizationType` to specify whether you want to authorise delegating, undelegating or redelegating (i.e. these have to be authorised separately). It also takes an optional `MaxTokens` that keeps track of a limit to the amount of tokens that can be delegated/undelegated/redelegated. If left empty, the amount is unlimited. Additionally, this Msg takes an `AllowList` or a `DenyList`, which allows you to select which validators you allow or deny grantees to stake with.
 
 ```protobuf reference
 https://github.com/cosmos/cosmos-sdk/blob/v0.47.0-rc1/proto/cosmos/staking/v1beta1/authz.proto#L11-L35