Fix typo

[ykc415]

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For contributor use:

• 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
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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #5523 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5523      +/-   ##
==========================================
- Coverage   54.36%   54.35%   -0.02%     
==========================================
  Files         313      313              
  Lines       18908    18908              
==========================================
- Hits        10279    10277       -2     
- Misses       7842     7844       +2     
  Partials      787      787

Impacted Files	Coverage Δ
x/mock/app.go	62.83% <0%> (-1.36%)	⬇️