## Description
Closes: #XXXX
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## Description
This PR couple of bugs with expiration not being updated when we overwrite an existing grant with different expiry.
**Bug 1**
`grantee`, `granter` passed wrongly to the `getGrant` method here:
a187a1c321/x/feegrant/keeper/keeper.go (L55)
`grantee` is passed at `granter`'s place and vice versa
a187a1c321/x/feegrant/keeper/keeper.go (L181-L196)
**Bug 2**
The following `if` condition never gets satisfied, `getGrant` returns `err`, `grant` with two possible out comes which are `nil`, `grant` or `err`, `nil`
a187a1c321/x/feegrant/keeper/keeper.go (L56)
and also there is not only one possible error from `getGrant` with `fee-grant not found` and also one another possible error is unmarshal error, when there is an unmarshal error we should return the error.
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Closes: #10685
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## Description
ref: #8961
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Following up on [#9697](https://github.com/cosmos/cosmos-sdk/pull/9697#pullrequestreview-727295733), this PR is the first step for the #8961.
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* -add comments to proto fields
-add comments to msg and query server
-remove decorator from docs
-add coments to msgs.go
-remove decorator from godoc
* Update x/feegrant/spec/04_events.md
Co-authored-by: Marie Gauthier <marie.gauthier63@gmail.com>
* refactor and add to docs
*refactor proto msg names and functions
*add docs pertaining to auth's ante handler for deducted fees
* lint
* update comment
* gofmt
Co-authored-by: technicallyty <48813565+tytech3@users.noreply.github.com>
Co-authored-by: Marie Gauthier <marie.gauthier63@gmail.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
