Docs: Correct addon-themes README to align text with code example

[schallerala]

Closes #

none, fixing miss-alignment in documentation.

What I did

Align text block reference with below code.

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

1. Using latest storybook and addon-themes (8.4.1)
2. able to override the theme for a specific story, as the code was already presenting

Documentation

• Add or update documentation reflecting your changes

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-storybook/src/sandbox-templates.ts
• Make sure this PR contains one of the labels

🦋 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

Updates the README.md documentation for addon-themes to correct the parameter name for theme overrides from themes.themeOverride to globals.theme, ensuring consistency with code examples.

• Fixed parameter name in /code/addons/themes/README.md to use globals.theme instead of themes.themeOverride
• Documentation now correctly reflects both meta-level and story-level theme override syntax

[greptile-apps]

LGTM

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[jonniebigodes]

@schallerala thanks for taking the time to put together this pull request and helping us improve the documentation by catching this small typo. Appreciate it 🙏 !

I've checked and all is good on my end. I'll gladly merge this once the checklist clears.

Have a fantastic day.

Stay safe

[nx-cloud]

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