MsgEditValidator json contains uppercase letter

[whitefen]

Summary of Bug

The field Description of MsgEditValidator is marshaled to json as 'Description' which contains an uppercase letter. Other fields are all lowercase.

{
    "type":"cosmos-sdk/MsgEditValidator",
    "value":{
        "Description":{
            "moniker":"nodeAAA",
            "identity":"CF1FAAA36A78BE02",
            "website":"www.example.com",
            "details":"DETAILS"
        },
        "address":"xxx",
        "commission_rate":null,
        "min_self_delegation":null
    }
}

Version

lastest

Steps to Reproduce

https://github.com/cosmos/cosmos-sdk/blob/master/x/staking/types/msg.go#L185

Suggestion

Add json tag.

type MsgEditValidator struct {
	Description `json:"description" yaml:"description"`
	ValidatorAddress sdk.ValAddress `json:"address" yaml:"address"`
	...
}

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