Update missing closed brace to the insert.CSS

[mosabab]

Description

Update missing closed brace to the insert.CSS example.

Testing

Update missing closed brace to the insert.CSS by adding } to the script and work perfect.

Checklist

• [ x] I've run the tests to see all new and existing tests pass
• [ x] I added automated test coverage as appropriate for this change
• [ x] Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• [ x] If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• [ x] I've updated the documentation if necessary

[breautek]

Ignore the totalpave approval, haha... didn't realise I was on the work account 😆

[breautek]

Thank you very much for providing the typo correction.

[mosabab]

Thanks @breautek for your approve, and you are welcome :)