chore: Add proto comments for MsgCreatePeriodicVestingAccountResponse

[amaury1093]

Description

We merged #9596, but we forgot to add proto comments for one message.

Then, proto lint CI fails on unrelated PRs, e.g. https://github.com/cosmos/cosmos-sdk/pull/9759/checks?check_run_id=3421076482#step:4:24. This fixes it.

Also related to #9978

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Author Checklist

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please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

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I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

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[codecov]

Codecov Report

Merging #10007 (40c6648) into master (a15d7e3) will increase coverage by 0.18%.
The diff coverage is n/a.

❗ Current head 40c6648 differs from pull request most recent head 907f0de. Consider uploading reports for the commit 907f0de to get more accurate results

@@            Coverage Diff             @@
##           master   #10007      +/-   ##
==========================================
+ Coverage   63.56%   63.75%   +0.18%     
==========================================
  Files         572      567       -5     
  Lines       53598    53461     -137     
==========================================
+ Hits        34072    34082      +10     
+ Misses      17582    17452     -130     
+ Partials     1944     1927      -17     

Impacted Files	Coverage Δ
server/mock/tx.go	63.15% <0.00%> (-1.85%)	⬇️
x/auth/middleware/gas.go
x/auth/middleware/recovery.go
x/auth/middleware/run_msgs.go
x/auth/middleware/index_events.go
x/auth/middleware/legacy_router.go
x/auth/middleware/middleware.go
x/auth/middleware/legacy_ante.go
x/auth/middleware/msg_service_router.go
baseapp/msg_service_router.go	80.88% <0.00%> (ø)
... and 10 more