Docs: Fix typo in api.md

[kazuyainoue0124]

What I did

This is my first OSS contribution, so I apologize if there are any mistakes.
Fixed a typo in the code/addons/themes/docs/api.md docs page.
If there are no issues with this PR, I will fix similar typos in other pages as well.

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=<PR_NUMBER>

Greptile Summary

This PR fixes a minor typo in the Storybook addon-themes documentation, improving its accuracy.

• Corrected the spelling of 'Vuetify' in a comment in code/addons/themes/docs/api.md
• Changed 'withVeutifyTheme.decorator.js' to 'withVuetifyTheme.decorator.js'
• This small correction enhances the clarity of the custom decorator example for Vuetify

[greptile-apps]

LGTM

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[kazuyainoue0124]

Danger task failing on branch due to a 403 on the GitHub user "Resource not accessible by integration".
"Could not add a commit status, the GitHub token for Danger does not have access rights."

What does this message mean?