Update liquidity.proto

[barriebyron]

making suggested edits here in this smaller, easier-to-process PR than in #235

Description

closes: #XXXX

---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[codecov]

Codecov Report

Merging #374 (62a3830) into develop (c51e12a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #374   +/-   ##
========================================
  Coverage    83.09%   83.09%           
========================================
  Files           20       20           
  Lines         2248     2248           
========================================
  Hits          1868     1868           
  Misses         208      208           
  Partials       172      172           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c51e12a...62a3830. Read the comment docs.

[hallazzang]

Thank you @barriebyron.
The generation of the corresponding *.pb.go files is needed too, do you mind if I do it for you and push to your branch?

[jaybxyz]

@hallazzang makes a good point that the generation of the corresponding *.pb.go files is needed when there is a change in any of the .proto files. Since this requires development environment in your computer, we will handle this.

[jaybxyz]

On top of what @hallazzang says, it seems like test coverage fails. Let me pull this branch and test it out.